A lot of people died :(
In terms of number of ships , the Okinawa invasion fleet was larger. In terms of casualties the number was far greater at Okinawa. The US Navy deaths were higher than Marines or Army.
The major cause of the battle of Okinawa was for strategy. The U.S. was capturing islands around Japan preparing for an invasion of main land Japan. It never happened. INstead we dropped 2 atomic bombs on them.
Yes, by 20,000 men.
Okinawa
The Americans needed the airfields and needed the island to marshal forces for an invasion of the Japanese mainland .
On April 1st, 1945, the last major invasion in the pacific for the US was the battle for Okinawa
Okinawa
It allowed the American airforce to reach further into Japan.
battle of okinawa
Japan
the Japanese dug an tunnel network under ground on a huge scale to avoid bombings from allied ships, before the invasion of Okinawa.
roughly 4 to 5 thousand depends on condition