Battery Rawlins was completed in 1899 and was equipped with 2- 10" guns. The Guns were removed during World War I, and in 1945 the battery was converted for use as an anti-aircraft battery (note the gun emplacements have been filled in to support the smaller A.A. guns). Fort Flagler was established on the north end of Marrowstone Island in 1897. Along with Forts Casey and Worden, Fort Flagler helped defend Admiralty Inlet, the vital passage to the Bremerton Naval Shipyard and ports in Seattle & Tacoma. Today Fort Flagler State Park maintains the same borders as the original fort, with hiking trails, beaches, camping, museum, 5 vacation houses, retreat center and 10 historic gun batteries open for public exploration.