Fort Drum (El Fraile Island), also known as the “concrete battleship,” is a heavily fortified island fortress situated at the mouth of Manila Bay in the Philippines, due south of Corregidor Island. It was occupied by the Japanese in World War II, and was recaptured by the U.S. after igniting oil and gasoline in the fort, leaving it permanently out of commission. Fort Drum was named for Brigadier General Richard C. Drum.