Today In History - June 21 | Library Of Congress

On June 21, 1945, Japanese troops were defeated on the Pacific island of Okinawa after one of the longest and bloodiest battles of World War II. Having seized the Ryukyu Islands from Japanese control, the United States next prepared to launch an onslaught against the Japanese mainland.

In September 1940, Japan allied itself with Germany and Italy to form the Axis powers and established a base in French Indochina. One year later, Japan moved troops to southern French Indochina and was poised to move against the Netherlands Indies, seeking to acquire an oil source.

When the United States, Britain, and the Netherlands placed an embargo on oil exports to Japan, that country responded quickly with an attack against the U.S. fleet at Pearl Harbor. Japanese military forces occupied the Philippines, the Netherlands Indies, Malaya, and Singapore in rapid succession, and invaded Burma and Thailand, achieving its goal of complete control of the South Pacific.

In the meantime, the United States had mobilized its industrial and economic resources. The Office of War Information, created in June 1942, generated a propaganda campaign to mobilize the manpower and the womanpower of the United States in support of the war effort.

During its offensive in the Pacific, Japan had captured many American and Filipino prisoners, who were enduring forced marches and cruelty in prisoner of war camps. Reports of these atrocities fueled American resolve to defeat Japan. The tide turned with the Battle of Midway in June 1942, at the northern tip of the Hawaiian islands, where the United States began its counteroffensive by air and sea, successfully crippling the Japanese fleet.

The U.S. strategy for conquering Japan was to capture a succession of weaker Japanese outposts, “island-hopping” toward the Japanese mainland. Slowly, in many bloody battles in the Pacific jungle, at Guadalcanal, the Solomon Islands, the Philippines, and Iwo Jima, the U.S. forces wrested Pacific territory from the Japanese, island by island.

Okinawa was the last critical outpost the United States needed to reclaim before launching an attack on the Japanese home islands. As in the progressive invasion of the other Pacific Islands, the U.S. began the onslaught with a series of air attacks on Okinawa and islands nearby, from October 1944 to March 1945.

From this time until the end of the war, the Japanese responded with an intense and desperate effort, increasing the kamikaze attacks on American ships and other targets and introducing to these suicide missions a new weapon, the baka, a piloted missile. In these guided missiles, the pilot reached more than 600 miles per hour in his final dive, and crashed into his target with more than a ton of explosives built into the nose of the aircraft.

On April 1, 1945, some 60,000 U.S. troops landed on the beaches, where they met with little resistance. However, more than 77,000 Japanese troops of the 32d Army were on the island under the command of Lieutenant General Mitsuru Ushijima, who withdrew his soldiers to the southern section of the island where the Japanese held out for nearly three months—hiding in the jungle and in caves, and engaging the Americans in intense guerilla warfare. Some 12,000 American lives and 110,000 Japanese lives were lost in the campaign. To avoid the dishonor of enemy capture, General Ushijima committed ritual suicide on June 23 as approaching U.S. forces were mopping up pockets of Japanese resistance.

Japan still refused to concede that World War II was over even after their defeat on Okinawa. The ultimate surrender of Japan to the Allies would be, according to Japanese cultural norms, an unthinkable dishonor. However, Japan was able to hold out less than two more months. Emperor Hirohito was forced into an unconditional surrender in August 1945 after the cities of Hiroshima and Nagasaki were decimated by the United States’ new weapon of mass destruction, the atomic bomb.