Yamamoto's plan

Midway Atoll, several months before the battle. Eastern Island (with the airfield) is in the foreground, and the larger Sand Island is in the background to the west.

Typical of Japanese naval planning during World War II, Yamamoto's battle plan for taking Midway (named Operation MI) was exceedingly complex.^[19] It required the careful and timely coordination of multiple battle groups over hundreds of miles of open sea. His design was also predicated on optimistic intelligence suggesting that USS Enterprise and USS Hornet, forming Task Force 16, were the only carriers available to the Pacific Fleet. During the Battle of the Coral Sea one month earlier, USS Lexington had been sunk and USS Yorktown suffered so much damage that the Japanese believed she too had been lost.^[20] However, following hasty repairs at Pearl Harbor, Yorktown sortied and ultimately played a critical role in the discovery and eventual destruction of the Japanese fleet carriers at Midway. Finally, much of Yamamoto's planning, coinciding with the general feeling among the Japanese leadership at the time, was based on a gross misjudgment of American morale which was believed to be debilitated from the string of Japanese victories in the preceding months.^[21]

Yamamoto felt deception would be required to lure the U.S. fleet into a fatally compromised situation.^[22] To this end, he dispersed his forces so that their full extent (particularly his battleships) would be concealed from the Americans prior to battle. Critically, Yamamoto's supporting battleships and cruisers trailed Vice Admiral Chūichi Nagumo's carrier force by several hundred miles. They were intended to come up and destroy whatever elements of the U.S. fleet might come to Midway's defense once Nagumo's carriers had weakened them sufficiently for a daylight gun battle.^[23] This tactic was doctrine in most major navies of the time.^[24]

What Yamamoto did not know was that the U.S. had broken parts of the main Japanese naval code (dubbed JN-25 by the Americans), divulging many details of his plan to the enemy. His emphasis on dispersal also meant none of his formations was in a position to support the others.^[25] For instance, although Nagumo's carriers were expected to carry out strikes against Midway and bear the brunt of American counterattacks, the only warships in his fleet larger than the screening force of twelve destroyers were two Kongō-class fast battleships, two heavy cruisers, and one light cruiser. By contrast, Yamamoto and Kondo had between them two light carriers, five battleships, four heavy cruisers, and two light cruisers, none of which saw action at Midway.^[23]

The light carriers of the trailing forces and Yamamoto's three battleships were unable to keep pace with the carriers of the Kidō Butai and so could not have sailed in company with them. The Kidō Butai would sail into range at best speed so as to increase the chance of surprise and would not have ships spread out across the ocean guiding the enemy toward it. If the other parts of the invasion force needed more defense, the Kidō Butai would make best speed to defend them. Hence the slower ships could not be with the Kidō Butai. The distance between Yamamoto and Kondo's forces and Nagumo's carriers had grave implications during the battle. The invaluable reconnaissance capability of the scout planes carried by the cruisers and carriers, as well as the additional anti-aircraft capability of the cruisers and the other two battleships of the Kongō-class in the trailing forces, were unavailable to help Nagumo.^[26]

Aleutian invasion

In order to obtain support from the IJA for the Midway operation, the IJN agreed to support their invasion of the United States through the Aleutian Islands of Attu and Kiska, part of the organized incorporated Alaska Territory. The IJA occupied these islands to place the Japanese home islands out of range of U.S. land-based bombers in Alaska. Similarly, most Americans feared that the occupied islands would be used as bases for Japanese bombers to attack strategic targets and population centers along the West Coast of the United States.

The Japanese operations in the Aleutians (Operation AL) removed yet more ships that could otherwise have augmented the force striking Midway. Whereas many earlier historical accounts considered the Aleutians operation as a feint to draw American forces away, according to the original Japanese battle plan, AL was intended to be launched simultaneously with the attack on Midway. A one-day delay in the sailing of Nagumo's task force resulted in Operation AL beginning a day before the Midway attack.^[27]

American reinforcements

USS Yorktown at Pearl Harbor days before the battle

To do battle with an enemy expected to muster four or five carriers, Admiral Chester W. Nimitz, Commander in Chief, Pacific Ocean Areas, needed every available flight deck. He already had Vice Admiral William Halsey's two-carrier (Enterprise and Hornet) task force at hand, though Halsey was stricken with shingles and had to be replaced by Rear Admiral Raymond A. Spruance, Halsey's escort commander.^[28] Nimitz also hurriedly recalled Rear Admiral Frank Jack Fletcher's task force, including the carrier Yorktown, from the South West Pacific Area.^[29]

Despite estimates that Yorktown, damaged in the Battle of the Coral Sea, would require several months of repairs at Puget Sound Naval Shipyard, her elevators were intact and her flight deck largely so.^[30] The Pearl Harbor Naval Shipyard worked around the clock, and in 72 hours she was restored to a battle-ready state,^[31] judged good enough for two or three weeks of operations, as Nimitz required.^[32][33] Her flight deck was patched, and whole sections of internal frames were cut out and replaced. Repairs continued even as she sortied, with work crews from the repair ship USS Vestal, herself damaged in the attack on Pearl Harbor six months earlier, still aboard.^[34]

Yorktown's partially depleted air group was rebuilt using whatever planes and pilots could be found. Scouting Five (VS-5) was replaced with Bombing Three (VB-3) from USS Saratoga. Torpedo Five (VT-5) was also replaced by Torpedo Three (VT-3). Fighting Three (VF-3) was reconstituted to replace VF-42 with sixteen pilots from VF-42 and eleven pilots from VF-3, with Lieutenant Commander John S. "Jimmy" Thach in command. Some of the aircrew were inexperienced, which may have contributed to an accident in which Thach's executive officer Lieutenant Commander Donald Lovelace was killed.^[35] Despite efforts to get Saratoga (which had been undergoing repairs on the American West Coast) ready, the need to resupply and assemble sufficient escorts meant she was unable to reach Midway until after the battle.^[36]

On Midway, by 4 June the U.S. Navy had stationed four squadrons of PBYs—31 aircraft in total—for long-range reconnaissance duties, and six brand-new Grumman TBF Avengers from Hornet's VT-8.^[37] The Marine Corps stationed 19 Douglas SBD Dauntless, seven F4F-3 Wildcats, 17 Vought SB2U Vindicators, and 21 Brewster F2A Buffalos. The USAAF contributed a squadron of 17 B-17 Flying Fortresses and four Martin B-26 Marauders equipped with torpedoes: in total 126 aircraft. Although the F2As and SB2Us were already obsolete, they were the only aircraft available to the Marine Corps at the time.^[38]

Japanese shortcomings

Akagi (April 1942)

During the Battle of the Coral Sea one month earlier, the Japanese light carrier Shōhō had been sunk, while the fleet carrier Shōkaku had been severely damaged by three bomb hits and was in drydock for months of repair. Although the fleet carrier Zuikaku escaped the battle undamaged, she had lost almost half her air group and was in port at the Kure Naval District in Hiroshima, awaiting replacement planes and pilots. That there were none immediately available can be attributed to the growing inability of the IJN to properly train pilots faster than they were killed in action. In desperation, instructors from the Yokosuka Air Corps were relieved of their duties to plug the gap.^[39]

Historians Jonathan Parshall and Anthony Tully believe that by combining the surviving aircraft and pilots from Shōkaku and Zuikaku, it is likely that Zuikaku could have been equipped with almost a full composite air group. They also note, however, that doing so would have violated Japanese carrier doctrine, which stressed that carriers and their air groups must train as a single unit. (In contrast, American air squadrons were considered interchangeable between carriers allowing for more flexibility.) In any case, the Japanese apparently made no serious attempt to get Zuikaku ready for the forthcoming battle.^[40]

Thus, Carrier Division 5, consisting of the two most advanced aircraft carriers of the Kido Butai, was not available which meant that Vice-Admiral Nagumo had only two-thirds of the fleet carriers at his disposal: Kaga and Akagi forming Carrier Division 1 and Hiryū and Sōryū making up Carrier Division 2. This was partly due to fatigue; Japanese carriers had been constantly on operations since 7 December 1941 including raids on Darwin and Colombo.^[41] Nonetheless, the First Carrier Strike Force sailed with 248 available aircraft on the four carriers (60 on Akagi, 74 on Kaga (B5N2 squadron oversized), 57 on Hiryū and 57 on Sōryū).^[42]

The main Japanese carrier-borne strike aircraft were the Aichi D3A1 "Val" dive bomber and the Nakajima B5N2 "Kate", which was used either as a torpedo bomber or as a level bomber. The main carrier fighter was the fast and highly maneuverable Mitsubishi A6M Zero. For a variety of reasons, production of the "Val" had been drastically reduced, while that of the "Kate" had been stopped completely and, as a consequence, there were none available to replace losses.^[43] In addition, many of the aircraft being used during the June 1942 operations had been operational since late November 1941 and, although they were well-maintained, many were almost worn out and had become increasingly unreliable. These factors meant all carriers of the Kidō Butai had fewer aircraft than their normal complement, with few spare aircraft or parts stored in the carriers' hangars.^{[44][nb 1]}

In addition, Nagumo's carrier force suffered from several defensive deficiencies which gave it, in Mark Peattie's words, a "'glass jaw': it could throw a punch but couldn't take one."^[46] Japanese carrier anti-aircraft guns and associated fire control systems had several design and configuration change deficiencies which limited their effectiveness. The IJN's fleet combat air patrol (CAP) consisted of too few fighter aircraft and was hampered by an inadequate early warning system, including a lack of radar. Poor radio communications with the fighter aircraft inhibited effective command and control of the CAP. The carriers' escorting warships were deployed as visual scouts in a ring at long range, not as close anti-aircraft escorts, as they lacked training, doctrine, and sufficient anti-aircraft guns.^[47]

Japanese strategic scouting arrangements prior to the battle were also in disarray. A picket line of Japanese submarines was late getting into position (partly because of Yamamoto's haste), which let the American carriers reach their assembly point northeast of Midway (known as "Point Luck") without being detected.^[48] A second attempt at reconnaissance, using four-engine H8K "Emily" flying boats to scout Pearl Harbor prior to the battle and detect whether the American carriers were present, part of Operation K, was thwarted when Japanese submarines assigned to refuel the search aircraft discovered that the intended refueling point—a hitherto deserted bay off French Frigate Shoals—was now occupied by American warships because the Japanese had carried out an identical mission in March. Thus, Japan was deprived of any knowledge concerning the movements of the American carriers immediately before the battle.^[49]

Japanese radio intercepts did notice an increase in both American submarine activity and message traffic. This information was in Yamamoto's hands prior to the battle. Japanese plans were not changed; Yamamoto, at sea in Yamato, assumed Nagumo had received the same signal from Tokyo and did not communicate with him by radio, so as not to reveal his position.^[50] These messages were, contrary to earlier historical accounts, also received by Nagumo before the battle began. For reasons that remain unclear, Nagumo did not alter his plans or take additional precautions.^[51]

U.S. code-breaking

Nimitz had one critical advantage: U.S. cryptanalysts had partially broken the Japanese Navy's JN-25b code.^[52] Since early 1942, the U.S. had been decoding messages stating that there would soon be an operation at objective "AF." It was initially not known where "AF" was, but Commander Joseph Rochefort and his team at Station HYPO were able to confirm that it was Midway: Captain Wilfred Holmes devised a ruse of telling the base at Midway (by secure undersea communications cable) to broadcast an uncoded radio message stating that Midway's water purification system had broken down.^[53] Within 24 hours, the code breakers picked up a Japanese message that "AF was short on water."^[54] No Japanese radio operators who intercepted the message seemed concerned that the Americans were broadcasting uncoded that a major naval installation close to the Japanese was having a water shortage, which Japanese intelligence might have suspected as deception.^[55] HYPO was also able to determine the date of the attack as either 4 or 5 June, and to provide Nimitz with a complete IJN order of battle.^[56]

Japan had a new codebook, but its introduction had been delayed, enabling HYPO to read messages for several crucial days; the new code, which took several days to be cracked, came into use on 24 May, but the important breaks had already been made.^[57] As a result, the Americans entered the battle with a good picture of where, when, and in what strength the Japanese would appear. Nimitz knew that the Japanese had negated their numerical advantage by dividing their ships into four separate task groups, so widely separated that they were essentially unable to support each other.^[58] This dispersal resulted in few fast ships being available to escort the Carrier Striking Force, thus reducing the number of anti-aircraft guns protecting the carriers. Nimitz calculated that the aircraft on his three carriers, plus those on Midway Island, gave the U.S. rough parity with Yamamoto's four carriers, mainly because American carrier air groups were larger than Japanese ones. The Japanese, by contrast, remained largely unaware of their opponent's true strength and dispositions even after the battle began.^[57]

Initial air attacks

At about 09:00 on 3 June, Ensign Jack Reid, piloting a PBY from U.S. Navy patrol squadron VP-44,^[60] spotted the Japanese Occupation Force 500 nmi (580 mi; 930 km) to the west-southwest of Midway. He mistakenly reported this group as the Main Force.^[61] Nine B-17s took off from Midway at 12:30 for the first air attack. Three hours later, they found Tanaka's transport group 570 nmi (660 mi; 1,060 km) to the west.^[62]

Harassed by heavy anti-aircraft fire, they dropped their bombs. Although their crews reported hitting four ships,^[62] none of the bombs actually hit anything and no significant damage was inflicted.^[63] Early the following morning, the Japanese oil tanker Akebono Maru sustained the first hit when a torpedo from an attacking PBY struck her around 01:00. This was the only successful air-launched torpedo attack by the U.S. during the entire battle.^[63]

At 04:30 on 4 June, Nagumo launched his initial attack on Midway, consisting of 36 D3As and 36 B5Ns, escorted by 36 Zero fighters. At the same time, he launched his seven search aircraft (2 B5Ns from Akagi and Kaga; 4 Aichi E13A "Jakes" from the heavy cruiser Tone and Chikuma; and 1 short range Nakajima E8N "Dave" from the battleship Haruna; an eighth aircraft from Tone launched 30 minutes late). Japanese reconnaissance arrangements were flimsy, with too few aircraft to adequately cover the assigned search areas, laboring under poor weather conditions to the northeast and east of the task force. As Nagumo's bombers and fighters were taking off, 11 PBYs were leaving Midway to run their search patterns. At 05:34, a PBY reported sighting two Japanese carriers and another spotted the inbound airstrike 10 minutes later.^[64]

Midway's radar picked up the enemy at a distance of several miles, and interceptors were scrambled. Unescorted bombers headed off to attack the Japanese carriers, their fighter escorts remaining behind to defend Midway. At 06:20, Japanese carrier aircraft bombed and heavily damaged the U.S. base. Midway-based Marine fighters led by Major Floyd B. Parks, which included six F4F Wildcats and 20 F2As,^[65] intercepted the Japanese and suffered heavy losses, though they managed to destroy four B5Ns and one Zero. Within the first few minutes, two F4Fs and 13 F2As were destroyed, while most of the surviving U.S. planes were damaged, with only two remaining airworthy. American anti-aircraft fire was intense and accurate, destroying three Japanese aircraft and damaging many more.^[66]

Of the 108 Japanese aircraft involved in this attack, 11 were destroyed (including three that ditched), 14 were heavily damaged, and 29 were damaged to some degree. The initial Japanese attack did not succeed in neutralizing Midway: American bombers could still use the airbase to refuel and attack the Japanese invasion force, and most of Midway's land-based defenses similarly remained intact. Japanese pilots reported to Nagumo that a second aerial attack on Midway's defenses would be necessary if troops were to go ashore by 7 June.^[67]

Having taken off prior to the Japanese attack, American bombers based on Midway made several attacks on the Japanese carrier force. These included six Grumman Avengers, detached to Midway from Hornet's VT-8 (Midway was the combat debut of both VT-8 and the Avenger); Marine Scout-Bombing Squadron 241 (VMSB-241), consisting of 11 SB2U-3s and 16 SBDs, plus four USAAF B-26s of the 18th Reconnaissance and 69th Bomb Squadrons armed with torpedoes, and 15 B-17s of the 31st, 72nd, and 431st Bomb Squadrons. The Japanese repelled these attacks and the attacking force, losing only three Zero fighters while destroying five Avengers, two SB2Us, eight SBDs, and two B-26s.^[68][69] Among the dead was Major Lofton R. Henderson of VMSB-241, killed while leading his inexperienced SBD squadron into action. The main airfield at Guadalcanal was named after him in August 1942.^[70]

One B-26, piloted by Lieutenant James Muri, after dropping his torpedo and searching for a safer escape route, flew directly down the length of Akagi while being fired upon by fighters and anti-aircraft fire, which had to hold their fire to avoid hitting their own flagship. As it flew down the length of the ship, the B-26 strafed Akagi, killing two men.^[71][72] Another B-26, piloted by Lieutenant Herbert Mayes, did not pull out of its run after being seriously damaged by anti-aircraft fire, and instead headed directly for Akagi's bridge.^[73] Either attempting a suicide ramming or out of control, the plane narrowly missed the bridge and crashed into the sea.^[74] This experience may well have contributed to Nagumo's determination to launch another attack on Midway in direct violation of Yamamoto's order to keep the reserve strike force armed for anti-ship operations.^[75]

While the air strikes from Midway were going on, the American submarine USS Nautilus (SS-168), commanded by Lieutenant Commander William Brockman, found herself near the Japanese fleet, attracting attention from the escorts. Around 08:20, she made an unsuccessful torpedo attack on a battleship and then had to dive to evade the escorts.^[76] At 09:10, she launched a torpedo at a cruiser and again had to dive to evade the escorts, with destroyer Arashi spending considerable time chasing Nautilus.^[77]

Nagumo's dilemma

A B-17 attack misses Hiryū; this was taken between 08:00–08:30. A Shotai of three Zeros is lined up near the bridge. This was one of several combat air patrols launched during the day.^[78]

In accordance with Yamamoto's orders for Operation MI, Nagumo had kept half of his aircraft in reserve. These comprised two squadrons each of dive bombers and torpedo bombers. The dive bombers were as yet unarmed (this was doctrinal: dive bombers were to be armed on the flight deck). The torpedo bombers were armed with torpedoes should any American warships be located.^[79]

At 07:15, Nagumo ordered his reserve planes to be re-armed with contact-fused general-purpose bombs for use against land targets. This was a result of the attacks from Midway, as well as the morning flight leader's recommendation of a second strike. Re-arming had been underway for about 30 minutes when, at 07:40,^[80] the delayed scout plane from Tone signaled that it had sighted a sizable American naval force to the east, but neglected to specify its composition. Later evidence suggests Nagumo did not receive the sighting report until 08:00.^[81]

Nagumo quickly reversed his order to re-arm the bombers with general-purpose bombs and demanded that the scout plane ascertain the composition of the American force. Another 20–40 minutes elapsed before Tone's scout finally radioed the presence of a single carrier in the American force. This was one of the carriers from Task Force 16. The other carrier was not sighted.^[82]

Nagumo was now in a quandary. Rear Admiral Tamon Yamaguchi, leading Carrier Division 2 (Hiryū and Sōryū), recommended that Nagumo strike immediately with the forces at hand: 16 D3A1 dive bombers on Sōryū and 18 on Hiryū, and half the ready cover patrol aircraft.^[83] Nagumo's opportunity to hit the American ships^[84] was now limited by the imminent return of his Midway strike force. The returning strike force needed to land promptly or it would have to ditch into the sea. Because of the constant flight deck activity associated with combat air patrol operations during the preceding hour, the Japanese never had an opportunity to position ("spot") their reserve planes on the flight deck for launch.^[85]

The few aircraft on the Japanese flight decks at the time of the attack were either defensive fighters or, in the case of Sōryū, fighters being spotted to augment the combat air patrol.^[86] Spotting his flight decks and launching aircraft would have required at least 30 minutes.^[87] Furthermore, by spotting and launching immediately, Nagumo would be committing some of his reserves to battle without proper anti-ship armament, and likely without fighter escort; indeed, he had just witnessed how easily the unescorted American bombers had been shot down.^[88]

Japanese naval doctrine preferred the launching of fully constituted strikes rather than piecemeal attacks. Without confirmation of whether the American force included carriers (not received until 08:20), Nagumo's reaction was doctrinaire.^[89] In addition, the arrival of another land-based American air strike at 07:53 gave weight to the need to attack the island again. In the end, Nagumo decided to wait for his first strike force to land, and then launch the reserve, which would by then be properly armed with torpedoes.^[90]

Had Nagumo instead launched the available aircraft around 07:45 and risked the ditching of Tomonaga's aircraft, they would have formed a powerful and well-balanced force with the potential to sink two American carriers.^[91] Furthermore, fueled and armed aircraft inside the ships presented a significant additional hazard in terms of damage to the carriers in an event of attack, and keeping them on the decks was much more dangerous than getting them airborne.^[92] Whatever the case, at that point there was no way to stop the American strike against him, since Fletcher's carriers had launched their planes beginning at 07:00 (with Enterprise and Hornet having completed launching by 07:55, but Yorktown not until 09:08), so the aircraft that would deliver the crushing blow were already on their way. Even if Nagumo had not strictly followed carrier doctrine, he could not have prevented the launch of the American attack.^[93]

Attacks on the Japanese fleet

Ensign George Gay (right), sole survivor of VT-8's TBD Devastator squadron, in front of his aircraft, 4 June 1942

The Americans had already launched their carrier aircraft against the Japanese. Fletcher, in overall command aboard Yorktown, and benefiting from PBY sighting reports from the early morning, ordered Spruance to launch against the Japanese as soon as was practical, while initially holding Yorktown in reserve in case any other Japanese carriers were found.^[94]

Spruance judged that, though the range was extreme, a strike could succeed and gave the order to launch the attack. He then left Halsey's Chief of Staff, Captain Miles Browning, to work out the details and oversee the launch. The carriers had to launch into the wind, so the light southeasterly breeze would require them to steam away from the Japanese at high speed. Browning, therefore, suggested a launch time of 07:00, giving the carriers an hour to close on the Japanese at 25 kn (46 km/h; 29 mph). This would place them at about 155 nmi (287 km; 178 mi) from the Japanese fleet, assuming it did not change course. The first plane took off from Spruance's carriers Enterprise and Hornet a few minutes after 07:00.^[95] Fletcher, upon completing his own scouting flights, followed suit at 08:00 from Yorktown.^[96]

Fletcher, along with Yorktown's commanding officer, Captain Elliott Buckmaster, and their staffs, had acquired the first-hand experience needed in organizing and launching a full strike against an enemy force in the Coral Sea, but there was no time to pass these lessons on to Enterprise, commanded by Captain George Murray, and Hornet, commanded by Captain Marc Mitscher, which were tasked with launching the first strike.^[97] Spruance ordered the striking aircraft to proceed to target immediately rather than waste time waiting for the strike force to assemble, since neutralizing enemy carriers was the key to the survival of his own task force.^[96][97]

While the Japanese were able to launch 108 aircraft in just seven minutes, it took Enterprise and Hornet over an hour to launch 117.^[98] Spruance judged that the need to throw something at the enemy as soon as possible was greater than the need to coordinate the attack by aircraft of different types and speeds (fighters, bombers, and torpedo bombers). Accordingly, American squadrons were launched piecemeal and proceeded to the target in several different groups. It was accepted that the lack of coordination would diminish the impact of the American attacks and increase their casualties, but Spruance calculated that this was worthwhile, since keeping the Japanese under aerial attack impaired their ability to launch a counterstrike (Japanese tactics preferred fully constituted attacks), and he gambled that he would find Nagumo with his flight decks at their most vulnerable.^[96][97]

American carrier aircraft had difficulty locating the target, despite the positions they had been given. The strike from Hornet, led by Commander Stanhope C. Ring, followed an incorrect heading of 265 degrees rather than the 240 degrees indicated by the contact report. As a result, Air Group Eight's dive bombers missed the Japanese carriers.^[99] Torpedo Squadron 8 (VT-8, from Hornet), led by Lieutenant Commander John C. Waldron, broke formation from Ring and followed the correct heading. The 10 F4Fs from Hornet ran out of fuel and had to ditch.^[100]

Devastators of VT-6 aboard USS Enterprise being prepared for takeoff during the battle

Waldron's squadron sighted the enemy carriers and began attacking at 09:20, followed at 09:40^[101] by VF-6 from Enterprise, whose Wildcat fighter escorts lost contact, ran low on fuel, and had to turn back.^[100] Without fighter escort, all 15 TBD Devastators of VT-8 were shot down without being able to inflict any damage. Ensign George H. Gay, Jr. was the only survivor of the 30 aircrews of VT-8. He completed his torpedo attack on the carrier Sōryū before he was shot down, but Sōryū evaded his torpedo.^[102] Meanwhile, VT-6, led by Lieutenant Commander Eugene E. Lindsey lost 9 of its 14 Devastators (one ditched later), and 10 of 12 Devastators from Yorktown's VT-3 (who attacked at 10:10) were shot down with no hits to show for their effort, thanks in part to the abysmal performance of their unimproved Mark 13 torpedoes.^[103] Midway was the last time the TBD Devastator was used in combat.^[104]

The Japanese combat air patrol, flying Zeros,^[105] made short work of the unescorted, slow, under-armed TBDs. A few TBDs managed to get within a few ship-lengths range of their targets before dropping their torpedoes—close enough to be able to strafe the enemy ships and force the Japanese carriers to make sharp evasive maneuvers—but all of their torpedoes either missed or failed to explode.^[106] The performance of American torpedoes in the early months of the war was extremely poor, as shot after shot missed by running directly under the target (deeper than intended), prematurely exploded, or hit targets (sometimes with an audible clang) and failed to explode at all.^[107][108] Remarkably, senior Navy and Bureau of Ordnance officers never questioned why half a dozen torpedoes, released so close to the Japanese carriers, produced no results.^[109]

Pilots of Navy Torpedo Squadron 8 (VT-8) aboard USS Hornet, circa mid-May 1942. Only one member of VT-8 who flew from Hornet on 4 June 1942 survived in the action.

Despite their failure to score any hits, the American torpedo attacks achieved three important results. First, they kept the Japanese carriers off balance and unable to prepare and launch their own counterstrike. Second, the poor control of the Japanese CAP meant they were out of position for subsequent attacks. Third, many of the Zeros ran low on ammunition and fuel.^[110] The appearance of a third torpedo plane attack from the southeast by VT-3 from Yorktown, led by Lieutenant Commander Lance Edward Massey at 10:00 very quickly drew the majority of the Japanese CAP to the southeast quadrant of the fleet.^[111] Better discipline and the employment of a greater number of Zeros for the CAP might have enabled Nagumo to prevent (or at least mitigate) the damage caused by the coming American attacks.^[112]

By chance, at the same time VT-3 was sighted by the Japanese, three squadrons of SBDs from Enterprise and Yorktown were approaching from the southwest and northeast. The Yorktown squadron (VB-3) had flown just behind VT-3 but elected to attack from a different course. The two squadrons from Enterprise (VB-6 and VS-6) were running low on fuel because of the time spent looking for the enemy. Air Group Commander C. Wade McClusky, Jr. decided to continue the search and by good fortune spotted the wake of the Japanese destroyer Arashi, steaming at full speed to rejoin Nagumo's carriers after having unsuccessfully depth-charged U.S. submarine Nautilus, which had unsuccessfully attacked the battleship Kirishima.^[113] Some bombers were lost from fuel exhaustion before the attack commenced.^[114]

McClusky's decision to continue the search and his judgment, in the opinion of Admiral Chester Nimitz, "decided the fate of our carrier task force and our forces at Midway ..."^[115] All three American dive-bomber squadrons (VB-6, VS-6, and VB-3) arrived almost simultaneously at the perfect time, locations and altitudes to attack.^[116] Most of the Japanese CAP was directing its attention to the torpedo planes of VT-3 and was out of position; meanwhile, armed Japanese strike aircraft filled the hangar decks, fuel hoses snaked across the decks as refueling operations were hastily being completed, and the repeated change of ordnance meant that bombs and torpedoes were stacked around the hangars, rather than stowed safely in the magazines, making the Japanese carriers extraordinarily vulnerable.^[117]

Japanese counterattacks

Hiryū, the sole surviving Japanese aircraft carrier, wasted little time in counterattacking. Hiryū's first attack wave, consisting of 18 D3As and 6 Zeros, followed the retreating American aircraft and attacked the first carrier they encountered, Yorktown, hitting her with three bombs, which blew a hole in the deck, snuffed out all but one of her boilers, and destroyed one anti-aircraft mount. The damage forced Fletcher to move his command staff to the heavy cruiser Astoria. Damage control parties were able to temporarily patch the flight deck and restore power to several boilers within an hour, giving her a speed of 19 kn (35 km/h; 22 mph) and enabling her to resume air operations. Yorktown hoisted a flag signal to indicate a speed of 5 knots.^[130] Captain Buckmaster had his signalmen hoist a huge new (10 feet wide and 15 feet long) American flag from the foremast. Thirteen D3As and three Zeros were lost in this attack (two Zeros turned back early after they were damaged attacking some of Enterprise's SBDs returning from their attack on the Japanese carriers).^[131]

Yorktown at the moment of impact of a torpedo from a Nakajima B5N of Lieutenant Hashimoto's 2nd chūtai^[132]

Approximately one hour later, Hiryū's second attack wave, consisting of ten B5Ns and six escorting Zeros, arrived over Yorktown; the repair efforts had been so effective that the Japanese pilots assumed that Yorktown must be a different, undamaged carrier.^[133] They attacked, crippling Yorktown with two torpedoes; she lost all power and developed a 23-degree list to port. Five B5Ns and two Zeros were shot down in this attack.^[134]

News of the two strikes, with the mistaken reports that each had sunk an American carrier, greatly improved Japanese morale. The few surviving aircraft were all recovered aboard Hiryū. Despite the heavy losses, the Japanese believed that they could scrape together enough aircraft for one more strike against what they believed to be the only remaining American carrier.^[135]

American counterattack

Hiryū

Hiryū, shortly before sinking, photo taken by a Yokosuka B4Y off the carrier Hōshō^[136]

Late in the afternoon, a Yorktown scout aircraft located Hiryū, prompting Enterprise to launch a final strike of 24 dive bombers (including six SBDs from VS-6, four SBDs from VB-6, and 14 SBDs from Yorktown's VB-3). Despite Hiryū being defended by a strong cover of more than a dozen Zero fighters, the attack by Enterprise and orphaned Yorktown aircraft launched from Enterprise was successful: four bombs (possibly five) hit Hiryū, leaving her ablaze and unable to operate aircraft. Hornet's strike, launched late because of a communications error, concentrated on the remaining escort ships but failed to score any hits.^[137] Enterprise dive bomber Dusty Kleiss struck Hiryū on the bow, essentially crippling her.^[138][139]

After futile attempts at controlling the blaze, most of the crew remaining on Hiryū were evacuated, and the remainder of the fleet continued sailing northeast in an attempt to intercept the American carriers. Despite a scuttling attempt by a Japanese destroyer that hit her with a torpedo and then departed quickly, Hiryū stayed afloat for several more hours. She was discovered early the next morning by an aircraft from the escort carrier Hōshō, prompting hopes she could be saved or towed back to Japan. Soon after being spotted, Hiryū sank. Yamaguchi, together with the ship's captain, Tomeo Kaku, chose to go down with the ship, costing Japan perhaps its best carrier officer. One young sailor reportedly tried to go down with the ship with the officers but was denied.^[137]

As darkness fell, both sides took stock and made tentative plans for continuing the action. Fletcher, obliged to abandon the derelict Yorktown and feeling he could not adequately command from a cruiser, ceded operational command to Spruance. Spruance knew the United States had won a great victory, but he was still unsure of what Japanese forces remained and was determined to safeguard both Midway and his carriers. To aid his aviators, who had launched at extreme range, he had continued to close with Nagumo during the day and persisted as night fell.^[140]

Finally, fearing a possible night encounter with Japanese surface forces^[140] and believing Yamamoto still intended to invade (based in part on a misleading contact report from the submarine Tambor)^[141] Spruance changed course and withdrew to the east, turning back west towards the enemy at midnight.^[142] For his part, Yamamoto initially decided to continue the engagement and sent his remaining surface forces searching eastward for the American carriers. Simultaneously, he detached a cruiser raiding force to bombard the island. The Japanese surface forces failed to make contact with the Americans because Spruance had decided to briefly withdraw eastward, and Yamamoto ordered a general withdrawal to the west.^[143] It was fortunate for the U.S. that Spruance did not pursue, for had he come in contact with Yamamoto's heavy ships, including Yamato, in the dark, considering the Japanese Navy's superiority in night-attack tactics at the time, there is a very high probability his cruisers would have been overwhelmed and his carriers sunk.^[144]

Spruance failed to reestablish contact with Yamamoto's forces on 5 June, despite extensive searches. Towards the end of the day, he launched a search-and-destroy mission to seek out any remnants of Nagumo's carrier force. This late afternoon strike narrowly missed detecting Yamamoto's main body and failed to score hits on a straggling Japanese destroyer. The strike planes returned to the carriers after nightfall, prompting Spruance to order Enterprise and Hornet to turn on their lights to aid the landings.^[145]

At 02:15 on 5 June Commander John Murphy's Tambor, lying 90 nmi (170 km; 100 mi) west of Midway, made the second of the submarine force's two major contributions to the battle's outcome, although its impact was heavily blunted by Murphy.^[146] Sighting several ships, neither Murphy nor his executive officer, Edward Spruance (son of Admiral Spruance), could identify them. Uncertain of whether they were friendly and unwilling to approach any closer to verify their heading or type, Murphy decided to send a vague report of "four large ships" to Admiral Robert English, Commander, Submarine Force, Pacific Fleet. This report was passed on by English to Nimitz, who then sent it to Spruance. Spruance, a former submarine commander, was "understandably furious" at the vagueness of Murphy's report, as it provided him with little more than suspicion and no concrete information on which to make his preparations.^[147] Unaware of the exact location of Yamamoto's "Main Body" (a persistent problem since the time PBYs had first sighted the Japanese), Spruance was forced to assume the "four large ships" reported by Tambor represented the main invasion force and so he moved to block it, while staying 100 nmi (190 km; 120 mi) northeast of Midway.^[148]

In reality, the ships sighted by Tambor were the detachment of four cruisers and two destroyers Yamamoto had sent to bombard Midway. At 02:55 these ships received Yamamoto's order to retire and changed course to comply.^[148] At about the same time as this change of course, Tambor was sighted and during maneuvers designed to avoid a submarine attack, the heavy cruisers Mogami and Mikuma collided, inflicting serious damage on Mogami's bow. The less severely damaged Mikuma slowed to 12 kn (22 km/h; 14 mph) to keep pace.^[149] Only at 04:12 did the sky brighten enough for Murphy to be certain the ships were Japanese, by which time staying surfaced was hazardous and he dived to approach for an attack. The attack was unsuccessful, and around 06:00 he finally reported two westbound Mogami-class cruisers before diving again and playing no further role in the battle.^[141] Limping along on a straight course at 12 knots—roughly one-third their top speed—Mogami and Mikuma had been almost perfect targets for a submarine attack. As soon as Tambor returned to port, Spruance had Murphy relieved of duty and reassigned to a shore station, citing his confusing contact report, poor torpedo shooting during his attack run, and general lack of aggression, especially as compared to Nautilus, the oldest of the 12 boats at Midway and the only one which had successfully placed a torpedo on target (albeit a dud).^[146][147]

Over the next two days, several strikes were launched against the stragglers, first from Midway, then from Spruance's carriers. Mikuma was eventually sunk by Dauntlesses,^[150] while Mogami survived further severe damage to return home for repairs. The destroyers Arashio and Asashio were also bombed and strafed during the last of these attacks.^[151] Captain Richard E. Fleming, a U.S. Marine Corps aviator, was killed while executing a glide bomb run on Mikuma and was posthumously awarded the Medal of Honor.^[152]

Meanwhile, salvage efforts on Yorktown were encouraging, and she was taken in tow by fleet tug USS Vireo. In the late afternoon of 6 June the Japanese submarine I-168, which had managed to slip through the cordon of destroyers (possibly because of the large amount of debris in the water), fired a salvo of torpedoes, two of which struck Yorktown. There were few casualties aboard since most of the crew had already been evacuated, but a third torpedo from this salvo struck the destroyer USS Hammann, which had been providing auxiliary power to Yorktown. Hammann broke in two and sank with the loss of 80 lives, mostly because her own depth charges exploded. With further salvage efforts deemed hopeless, the remaining repair crews were evacuated from Yorktown. Throughout the night of 6 June and into the morning of 7 June, Yorktown remained afloat; but by 05:30 on 7 June observers noted that her list was rapidly increasing to port. Shortly afterward, the ship turned onto her port side revealing the torpedo hole in her starboard bilge.^[153] At 07:01, the ship rolled upside-down and slowly sank, stern first.

Japanese and U.S. casualties

Mikuma shortly before sinking

SBD pilot Norman "Dusty" Kleiss, who scored three hits on Japanese ships during the Battle of Midway (aircraft carriers Kaga and Hiryū and heavy cruiser Mikuma), wrote: "From the experience in the Marshalls, at Wake and at Marcus, I thought our fleet learned its lessons. We could not send TBDs into action unless they had adequate smoke protection and torpedoes that exploded more than 10 percent of the time."^[154]

By the time the battle ended, 3,057 Japanese had died. Casualties aboard the four carriers were: Akagi: 267; Kaga: 811; Hiryū: 392 (including Yamaguchi who chose to go down with his ship); Soryū: 711 (including Captain Yanagimoto, who chose to remain on board); a total of 2,181.^[155] The heavy cruisers Mikuma (sunk; 700 casualties) and Mogami (badly damaged; 92) accounted for another 792 deaths.^[156]

In addition, the destroyers Arashio (bombed; 35) and Asashio (strafed by aircraft; 21) were both damaged during the air attacks which sank Mikuma and caused further damage to Mogami. Floatplanes were lost from the cruisers Chikuma (3) and Tone (2). Dead aboard the destroyers Tanikaze (11), Arashi (1), Kazagumo (1) and the fleet oiler Akebono Maru (10) made up the remaining 23 casualties.^{[nb 4]}

At the end of the battle, the U.S. lost the carrier Yorktown and the destroyer Hammann. 307 Americans had been killed, including Major General Clarence L. Tinker, Commander, 7th Air Force, who personally led a bomber strike from Hawaii against the retreating Japanese forces on 7 June. He was killed when his aircraft crashed near Midway Island.

American prisoners

Three U.S. aviators were captured during the battle: Ensign Wesley Osmus,^[172] a pilot from Yorktown; Ensign Frank O'Flaherty,^[173] a pilot from Enterprise; and Aviation Machinist's Mate Bruno Peter Gaido,^[174] O'Flaherty's radioman-gunner.^[175][176] Osmus was held on Arashi; O'Flaherty and Gaido on the cruiser Nagara (or destroyer Makigumo, sources vary); O'Flaherty and Gaido were interrogated and then killed by being tied to water-filled kerosene cans and thrown overboard to drown.^[177] Osmus was slated for the same fate; however, he resisted and was murdered on the Arashi with a fire axe, and his body was thrown overboard.^[175] The report filed by Nagumo tersely states that Osmus, "... died on 6 June and was buried at sea";^[178] O'Flaherty and Gaido's fates were not mentioned in Nagumo's report.^[179] The execution of Osmus in this manner was apparently ordered by Arashi's captain, Watanabe Yasumasa. Yasumasa died when the destroyer Numakaze sank in December 1943, but had he survived he would have likely been tried as a war criminal.^[180]

Japanese prisoners

Two enlisted men from Mikuma were rescued from a life raft on 9 June by USS Trout and taken to Pearl Harbor. After receiving medical care, at least one of these sailors cooperated during interrogation and provided intelligence.^[181] Another 35 crewmen from Hiryū were taken from a lifeboat by USS Ballard on 19 June after being spotted by an American search plane. They were taken to Midway and then transferred to Pearl Harbor on USS Sirius.^[182][183]