Corregidor is a tadpole-shaped island four miles long and about 1.5 miles at its widest point, with a total area roughly about three square miles. Its bulbous head, which points towards the South China Sea rises prominently to a large flat called Topside. This was the nerve center of the Island and here was located the headquarters, barracks for enlisted personnel, officers quarters, underground ordnance shops, the traditional parade grounds, and the bulk of the batteries that constituted the strength of Corregidor.

The Battle for the Recapture of Corregidor, from 16 February to 26 February 1945, by American liberation forces against the defending Japanese garrison on the island fortress used by the USAFFE, which was the last bastion to surrender to invading Japanese forces in 1942.

More here: http://en.wikipedia.org/wiki/Battle_of_Corregidor_%281945%29