On April 25, 1898, the United States declared war on Spain, heralding the beginning of the Spanish-American War. Fort De Soto, on Mullet Key, was commissioned to help defend the sea approach to Tampa Bay, Florida. The fort's main defensive feature was a grouping of eight 12-inch-bore mortars, each capable of dropping a half-ton projectile on enemy ships miles away; four of these historic mortars are still in place. In 1948, the fort's 884 acres were...