World War II

With world tension increasing on the eve of World War II, Montgomery reactivated, recommissioning on 25 September 1939. She trained for possible war service and completed several towing assignments on the west coast until 3 December 1940 when she sailed for her new home port, Pearl Harbor.

At Pearl Harbor during the Japanese attack on 7 December 1941, Montgomery immediately began anti-submarine patrols in the approaches to the vital base, as well as inter-island convoy duty. Departing Hawaii on 11 April 1942 for Suva, Fiji, Montgomery began 16 months operating from Suva, Espiritu Santo, and Nouméa for escort and minelaying operations in the southwest Pacific, aiding in the struggle for the Solomons. One interruption to this service was 22 September to 12 November, when she sailed north to lay mines in the Aleutians in preparation for the recapture of Attu and Kiska.

While laying a minefield off Guadalcanal on the night of 24 to 25 August 1943, Montgomery collided with Preble, losing 20 feet (6 m) of her bow. She made temporary repairs at Tulagi and Espiritu Santo, then sailed on 1 October for San Francisco, arriving on 19 October.

Repairs completed, Montgomery began ten months of activity which included two convoy escort voyages between San Francisco and Hawaii (8 December 1943 to 5 February 1944), defensive minelaying around Kwajalein (17 March to 4 April), convoy escort to Majuro (May 1944), and local convoy escort in the Hawaiians. Montgomery attacked an enemy submarine contact on 25 June 1944 without evident result. After an escort voyage to Eniwetok and return (28 June to 16 July), she sailed for Guadalcanal to prepare for the invasion of the Palaus.

Getting underway for the assault on 6 September, Montgomery took station off Peleliu on 12 September to destroy mines swept from the Japanese minefields. On 17 September she screened transports landing assault troops on Angaur, and two days later sailed for mine destruction and patrol duties at Ulithi until 14 October. She bombarded Ngulu on 15 October and acted as mother ship for small minelayers during the capture of the atoll.

While anchored off Ngulu on 17 October, with her engines secured, Montgomery sighted a mine floating close aboard to port. The wind swung the ship down onto the mine before she could get underway or destroy it. The resulting explosion flooded both engine rooms and one fireroom, ruptured fuel tanks, and killed four of her crew. Salvage efforts kept her afloat until she could be towed to Ulithi for repairs. Underway on her own power on 12 January 1945, Montgomery arrived at San Francisco on 14 February. There it was recommended that she be decommissioned, which she was on 23 April 1945. Montgomery was sold for scrapping on 11 March 1946.