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Some perspective...
Battle of Okinawa
The Battle of Okinawa, fought on the island of Okinawa in the Ryukyu Islands (south of the four big islands of Japan) was the largest amphibious assault during the Pacific campaign of World War II. It was the largest sea-land-air battle in history, running from April through June, 1945.
No one on either side expected it to be the last major battle of the war, which it was. The Americans were planning Operation Downfall, the invasion of the main islands, which never happened due to the controversial decision to use the atomic bomb.
At some battles such as Iwo Jima, there had been no civilians, but Okinawa had a large indigenous civilian population, and the civilian loss in the Typhoon of Steel was at least 130,000. American losses were were over 72,000 casualties, of whom 12,000 were killed or missing, over twice Iwo Jima and Guadalcanal combined.
The battle took place over about 82 days.