Thus augmented, the Home Fleet, with Capps in company, swept into northern waters from 29 October to 8 November to guard the movement of a convoy for Murmansk, and to hunt for the German battleships Tirpitz and Scharnhorst.

Forced back to San Francisco by a boiler casualty, Capps returned to action at Majuro 23 April, and was assigned to area escort, antisubmarine, and antiaircraft patrols.

She continued her activities with the 3rd Fleet until the close of the year, when she reported for a month of duty on radar picket station, in air-sea rescue, and escorting convoys from Saipan to Guam, Eniwetok, and Ulithi.

Her underwater demolition teams were skillfully landed and began their work of preparing the beaches for assault, and Capps remained on the firing line for 3 weeks, hurling more than 2,600 five-inch projectiles into the caves and hillsides of the tenaciously defended island.

Capps sailed through the mined waters south of the Nansei Shoto, guarding the escort carriers, rescuing downed aviators, and fighting back kamikaze attacks.