The Aleutian Campaign
By 7 August, the task force to which Indianapolis was attached finally found an opening in the thick fog which hid the Japanese stronghold at Kiska Island, and imperiled ships in the treacherous and partially uncharted nearby coasts. Indianapolis' 8-inch guns opened up along with those of the other ships. Although fog hindered observation, scout planes flown from the cruisers reported seeing ships sinking in the harbor and fires burning among shore installations. So complete was the tactical surprise that it was 15 minutes before shore batteries began to answer; and some of them fired into the air, believing they were being bombed. Most of them were silenced by accurate gunnery from the ships.
Japanese submarines then appeared but were promptly depth charged by American destroyers. Japanese seaplanes also made an ineffective bombing attack. The operation was considered a success despite the scanty information on its results. It also demonstrated the necessity of obtaining bases nearer the Japanese held islands. Consequently, U.S. forces occupied the island of Adak later in the month, providing a base suitable for surface craft and planes further along the island chain from Dutch Harbor.
Indianapolis returned to California for a major overhaul and upgrade, which included the addition of six AA mounts. Her bridge structure was modified to allow for the inclusion of high angle fire control radar and a second similar unit abaft the mainmast.
Returning to the north Pacific in January 1943, Indianapolis supported the U.S. occupation of Amchitka, which gave us another base in the Aleutians.
On the night of 19 February 1943, while Indianapolis and two destroyers patrolled southwest of Attu, hoping to intercept enemy ships running reinforcements and supplies into Kiska and Attu, she contacted a Japanese cargo ship, Akagane Maru. When challenged, the enemy tried to feign a reply but was shelled by Indianapolis' 8-inch guns. Since the Akagane Maru exploded with great force and left no survivors, she was presumably laden with ammunition.
Throughout the spring and summer of 1943, Indianapolis operated in Aleutian waters escorting American convoys and covering amphibious assaults. In May, the Navy took Attu, the first territory stolen by the Japanese to be reconquered by the United States. After Attu was proclaimed secure, the U.S. forces focused their attention on Kiska, the last enemy stronghold in the Aleutians. However, the Japanese managed to evacuate their entire garrison under cover of persistent, thick fog before our landings there 15 August.

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