Following this operation, "Louisville" returned to Pearl Harbor, proceeding from there to Mare Island Navy Yard, San Francisco, where her anti-aircraft armament was increased with additional 1.1 in and 20 mm cannon fitted. On 31 May, she steamed for the Aleutians to join TF 8 to counter the enemy forces expected to be in the area. Fortunately for "Louisville", the Japanese carrier force did not locate her and the other cruisers during the attacks on Dutch Harbor, which coincided with the Battle of Midway. Her duties, during this period of Japan's strongest efforts to establish the northern end of her "ribbon defense" in the western Aleutians, were primarily those of convoy escort, but included shore bombardment of Kiska Island.