became part of an early 20th-century residential development (now historic district) called Harbor Oaks. University of South Florida archaeologists excavated the site in 1977 after Alfred C. Wyllie discovered an underground ammunition bunker while digging a swimming pool on his estate. Clearwater would later become the first organized community on the peninsula as well as the site of its first post office. The Armed Occupation Act, passed in 1842, encouraged further settlement of Pinellas, like all of Florida, by offering 160 acres (0.65 km2) to anyone who would bear arms and cultivate the land. Pioneer families like the Booths, the Coachmans, the Marstons, and the McMullens established homesteads in the area in the years following, planting more citrus groves and raising cattle. During the American Civil War, many residents fought for the Confederate States of America. Brothers James and Daniel McMullen were members of the Confederate Cow Cavalry, driving Florida cattle to Georgia and the Carolinas to help sustain the war effort. John W. Marston served in the 9th Florida Regiment as a part of the Appomattox Campaign. Many other residents served in other capacities. Otherwise the peninsula had virtually no significance during the war, and the war largely passed the area by. On September 27, 1848, a strong hurricane struck the West Coast of Florida. It separated the barrier island on the coast and created a waterway known today as John's Pass. John Levique, along with Joseph Silva, was the one who discovered it and named it after himself and is now a federally owned canal. Tarpon Springs became West Hillsborough's first incorporated city in 1887, and in 1888 the Orange Belt Railway was extended into the southern portion of the peninsula. Railroad owner Peter Demens named the town that grew near the railroad's terminus St. Petersburg in honor of his hometown. The town would incorporate in 1892. Other major towns in the county incorporated during this time were Clearwater (1891), Dunedin (1899), and Largo (1905). Construction of Fort De Soto, on Mullet Key facing the mouth of Tampa Bay, was begun in 1898 during the Spanish–American War to protect Tampa Bay from potential invading forces. The fort, a subpost of Fort Dade on adjacent Egmont Key (which lies in the mouth of Tampa Bay), was equipped with artillery and mortar batteries. Birth of Pinellas County Even into the early years of the 20th century, West Hillsborough had no