She arrived at Coco Solo in February. During the spring, she conducted two defensive patrols in the Pacific approaches to the Panama Canal and, in June, she proceeded to San Diego, California, en route to the Aleutians. In early July, she arrived at Dutch Harbor; and, on 7 July, she departed that Unalaska base on her first offensive war patrol. She patrolled the fog-covered waters of the Rat Islands and Amchitka into August, then shifted to an area north of Attu, returning to Dutch Harbor on 10 July.