 Around the same time, the United States Army began construction of Fort Harrison, named after William Henry Harrison, as a rest post for soldiers from nearby Fort Brooke during the Second Seminole War.The new fort was located on a bluff overlooking Clear Water Harbor, which later 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.