For comparisons sake, military casualties, this battle was close to the scale of Okinawa....
Iwo Jima
US - 6,821 killed, 19,217 wounded
Japan 18,844 killed, 216 taken prisoner
Okinawa
US - More than 12,000 killed, 38,000 wounded
Japan - More than 110,000 killed, 7,000 captured