[Fiji Hill]

The scale of the assault was unlike anything the world had seen before or will most likely ever see again.

The invasion of Sicily in 1943 was also substantial, in that it involved about 150,000 troops, 3,000 ships and more than 4,000 aircraft.

[walkingdead]

Okinawa deserves a look too. For instance the Battle of Okinawa involved more ground troops, landing on the beach-heads than Normandy.