Japanese home islands in the context of "Imperial Japanese Navy land forces"

The Battle of Saipan was an amphibious assault launched by the United States against the Empire of Japan during the Pacific campaign of World War II between 15 June and 9 July 1944. The initial invasion triggered the Battle of the Philippine Sea, which effectively destroyed Japanese carrier-based airpower, and the battle resulted in the American capture of the island. Its occupation put the major cities of the Japanese home islands within the range of B-29 bombers, making them vulnerable to strategic bombing by the United States Army Air Forces. It also precipitated the resignation of Hideki Tōjō, the prime minister of Japan.

Saipan was the first objective in Operation Forager, the campaign to occupy the Mariana Islands that got underway at the same time the Allies were invading France in Operation Overlord. After a two-day naval bombardment, the U.S. 2nd Marine Division, 4th Marine Division, and the Army's 27th Infantry Division, commanded by Lieutenant General Holland Smith, landed on the island and defeated the 43rd Infantry Division of the Imperial Japanese Army, commanded by Lieutenant General Yoshitsugu Saitō. Organized resistance ended when at least 3,000 Japanese soldiers died in a mass gyokusai attack, and afterward about 1,000 civilians committed suicide.

The Singapore strategy was a naval defence policy of the United Kingdom that evolved in a series of war plans from 1919 to 1941. It aimed to deter aggression by Japan by providing a base for a fleet of the Royal Navy in the Far East, able to intercept and defeat a Japanese force heading south towards India or Australia. To be effective it required a well-equipped base. Singapore, at the eastern end of the Strait of Malacca, was chosen in 1919 as the location of this base; work continued on this naval base and its defences over the next two decades.

The planners envisaged that a war with Japan would have three phases: while the garrison of Singapore defended the fortress, the fleet would make its way from home waters to Singapore, sally to relieve or recapture Hong Kong, and blockade the Japanese home islands to force Japan to accept terms. The idea of invading Japan was rejected as impractical, but British planners did not expect that the Japanese would willingly fight a decisive naval battle against the odds. Aware of the impact of a blockade on an island nation at the heart of a maritime empire, they felt that economic pressure would suffice.