Fort Allen Park is a public park on the Eastern Promenade. It is the site of Fort Allen, which was active in the Revolutionary War and War of 1812; only a few earthworks remain. The park is home to an American Civil War monument in the form of a granite bench dedicated in 1929. It honors the Union Army. Fort Allen Park is also the home of the mast of , a heavy cruiser commissioned by the United States Navy in 1933. "Portland" was the only United States ship to participate in all four Pacific aircraft carrier battles of 1942: Coral Sea in May, Midway in June, Eastern Solomons in August, and Santa Cruz Islands in October. "Portland" was then damaged during the Naval Battle of Guadalcanal in November.