I might be odd for a woman, but I love history; in particular the history of World War 2. But as much as I’ve read about it, and as many documentaries and films as I’ve watched on the topic, I had never heard about this episode until I read a comment from a YouTube video which told about how that person’s grandfather had served in the only US territory to be occupied by the Japanese during the war: The Aleutian Islands.
Anyone who knows a bit about World War 2 probably knows about Midway – a pivotal point in the Pacific arena. But at the same time Japan was targeting that US island base in the middle of the Pacific, they also had their sites set on the Bering Strait; specifically, the six island groups of the Aleutian Islands. In June 1942, they attacked and occupied the US territory islands of Kiska and Attu. Anyone would be excused for thinking that these inhospitable, frozen, volcanic mountains rising out of the sea were insignificant, but they were a strategic launching point for keeping the Japanese at bay in the Pacific, and as a gateway for supplies to the Allied troops. If the Japanese managed to maintain their hold on those islands, it would strengthen the defence of their northern territories, and it was also feared that they would use the islands as springboards from which to attack the US West coast or invade through Alaska and into Canada and the northwestern mainland territory of the US. The battles there are considered the “forgotten battles” because, although there was public outrage in the US at the time, they were soon largely overshadowed in the press by Midway and by the Guadalcanal campaigns. But the number of casualties there was comparable to that of Pearl Harbor, and the Attu battle was better known in Japan than in America: It was a major propaganda coup for the Imperial Army.
To watch a 1943 documentary about the Aleutian Islands and their strategic significance, called “Forgotten Battle of the Aleutian Islands“, just click on the link (~45 min.). It not only gives a glimpse into the geography and military aspect, but the human aspect, showing the soldiers in their daily off-duty activities and their duties; it gives you a sense of what they were like, where they came from, and what they did. For a shorter summary (~12 min), click here.

Yes. The history of that is not well known. Epic stuff.