Fort Tompkins Quadrangle, also known as Fort Tompkins, is a fort on Staten Island, in the U.S. state of New York, perhaps within what is now Fort Wadsworth, or otherwise associated with Building 137 of Fort Wadsworth. It was constructed in 1860. The site was first fortified with a 1663 blockhouse and then during the Revolutionary War as the American redoubt Flagstaff Fort (1776), taken by the British it was enlarged and used to 1783. NYS started a masonry fort in 1807 - 1812. In the early 1840s Cpt. Robert E. Lee from Fort Hamilton proposed rebuilding the Staten Island works, which was done in 1860. Controlled Forts Morton, Hudson, and Richmond (Water Battery, later Battery Weed). It is the last of four forts in the U.S.