Following the War of 1812, the United States War Department began planning for the construction of an extensive system of masonry fortifications for coastal defense. Because of Ship Island's natural deep-water harbor and its location along a shipping route, Ship Island was important to the defense of New Orleans and the Gulf Coast. The island was declared a United States military reservation in 1847, and nine years later Congress authorized construction of a fort. A site on the north shore, approximately 500 feet (152 m) from the western tip of the island, was eventually selected as the location for the fort. Construction began in June 1859 under supervision of the Army Corps of Engineers. The work was primarily done by civilians. The work force sometimes numbered as many as 100 men, and i