Key Facts
- Duration
- 3 June 1942 – 15 August 1943
- Islands occupied by Japan
- Attu and Kiska
- Battle of Attu concluded
- 29 May 1943, after final banzai charge
- Kiska landing result
- Japanese had already withdrawn on 29 July 1943
- Theater
- American Theater / Pacific War, World War II
Strategic Narrative Overview
Following carrier-based strikes on Dutch Harbor in June 1942, Japanese forces occupied Attu and Kiska. Harsh weather, remote terrain, and logistical difficulties delayed an American-Canadian response for nearly a year. The U.S. launched its assault on Attu on 11 May 1943, culminating in a desperate Japanese banzai charge on 29 May. A large Allied invasion force then landed on Kiska on 15 August 1943 following a three-week bombardment, only to find the island abandoned.
01 / The Origins
Japan and the United States both recognized the Aleutian Islands as a gateway controlling Pacific transportation routes. The U.S. feared Japanese use of the islands as air-raid bases against West Coast cities, while Japan sought to block any American-Soviet cooperation and shield its northern flank. Some historians also argue the invasion was a diversionary feint coordinated with the Battle of Midway under Admiral Isoroku Yamamoto to draw the U.S. Pacific Fleet away from Midway Atoll.
03 / The Outcome
Japanese forces covertly evacuated Kiska on 29 July 1943, ending organized resistance in the Aleutians by mid-August. The United States and Canada reclaimed the islands entirely, securing the northern Pacific flank and eliminating any threat of Japanese air raids on North American cities. The campaign, often called the 'Forgotten Battle,' secured U.S. control of Alaska's island chain for the remainder of the war.
Belligerents & Mobilization Analysis
Side A
1 belligerent
Isoroku Yamamoto.
Side B
2 belligerents
Kinetic Engagement Axis
Scroll horizontally to view full axis. Events plotted relatively.