Underway for her seventh war patrol, "Pollack" departed Midway on 10 May to reconnoiter Ailuk Atoll and Wotje Atoll, then patrolled to the south and west towards Schischmarev Strait. On 18 May she torpedoed and sank the 3,110-ton ex-gunboat "Terushima Maru". Off Jaluit Atoll the next afternoon, she torpedoed and sank the 5,350-ton converted light cruiser "Bangkok Maru", which was carrying 1,200 Japanese troops intending to reinforce the garrison at Tarawa. "Pollack" received a depth charge attack and was lightly damaged. The timing of this attack was important in reducing the number of Japanese troops garrisoned on Tarawa, which was attacked by American forces several months later in the Battle of Tarawa. "Pollack" returned to Pearl Harbor on 25 June.