#27, Battle of Okinawa: The Typhoon of Steel That Killed 240,000
The Battle of Okinawa from April 1 to June 22, 1945, killed approximately 240,000 people, 12,510 Americans dead, 77,166 Japanese military killed, and an estimated 40,000 to 150,000 Okinawan civilians who perished in the crossfire, from Japanese-compelled mass suicides, or from American artillery and naval gunfire. The combined naval fleet supporting the invasion exceeded 1,300 ships, the largest armada in Pacific War history.
Okinawa's defenders, under General Mitsuru Ushijima, abandoned beach defenses in favor of a layered defense-in-depth across the island's southern ridges, caves, and fortified tombs. The Shuri Line, a network of mutually supporting positions anchored on Shuri Castle, held for nearly two months against constant bombardment. Japanese kamikaze attacks sank 36 Allied ships and damaged 368 more, killing 4,907 Navy personnel, more than the Marines lost on the ground. The battle lasted 82 days, the longest in the Pacific theater. Okinawa's staggering casualty figures directly influenced Truman's decision to drop atomic bombs on Hiroshima and Nagasaki, planners estimated an invasion of mainland Japan would cost over a million Allied and millions of Japanese casualties based on Okinawa's precedent.
