the importance of holding Fort Taylor if the Southern states seceded. An official report to the United States Secretary of War on December 28, 1860, stated that: "Lieutenant-General Scott will further ask the attention of the Secretary to Forts Jefferson and Taylor, which are wholly national, being of far greater value even to the most distant points of the Atlantic coast...than to the State of Florida. There is only a feeble company at Key West for the defense of Fort Taylor." At midnight on January 13, 1861, Union Captain John Milton Brannan moved his 44 men of the 1st U.S. Artillery Regiment from Key West Barracks to Fort Taylor. Despite having no orders to do so, Captain Brannan took the initiative in manning the fort to prevent it from falling into Confederate hands. It became a key outpost for threatening blockade runners during the Union blockade. Major William H. French arrived in April 1861 with his artillery unit. In 1898, the fort was reduced to two stories and Battery Osceola was added to the south casemate. The battery consisted of two 12-inch M1895 guns. The Civil War-era guns were used as fill, being buried within the new battery to save on materials. Battery Adair was added to the west casemate and included four 3-inch M1898 15-pounder rapid-fire rifles. The fort was heavily used again during the Spanish–American War (1898), World War I (1917–1918), World War II (1941–1945), and the Cuban Missile Crisis (1962). 1947–present No longer of use to the U.S. Army, the fort was turned over to the United States Navy in 1947 for maintenance. In 1968, volunteers led by Howard S. England excavated Civil War guns and ammunition buried in long-abandoned parts of the fort to form what would be considered the nation's largest collection of Civil War cannons. Fort Taylor was placed on the National Register of Historic Places in 1971 and designated a National Historic Landmark in 1973. Due to the filling in of land around the fort, including the creation of an attractive stretch of beach, the park now occupies . Truman Annex The fort's land closer to downtown Key West became part of the Truman Annex to Naval Air Station Key West. It was originally a separate major installation known as Naval Station Key West and, until it closed in 1974, included a submarine base. President Harry S. Truman used Naval Station Key West