Battle of the Komandorski Islands
In late September 1942, the Japanese garrison on Attu was transferred to Kiska, and then Attu was essentially left unoccupied, but American forces made no attempt to occupy Attu during this time. On October 29, 1942, the Japanese reestablished a base on Attu at Holtz Bay under the command of Lt. Col. Hiroshi Yanekawa. Initially the garrison was about 500 troops, but through reinforcements, that number reached about 2,300 by March 10, 1943. No more reinforcements arrived after that time, owing mainly to the efforts of the U.S. naval force under Rear Admiral Charles "Soc" McMorris, and U.S. Navy submarines. McMorris had been assigned to interdict the Japanese supply and reinforcement convoys. After the sizable naval Battle of the Komandorski Islands, the Japanese abandoned their attempts to resupply its Aleutian garrisons by surface ships. From then on, only submarines were used for the resupply runs.