 In the 1890s, Admiralty Inlet was considered strategic to the defense of Puget Sound in that three forts—Fort Worden, Fort Flagler, and Fort Casey—were built at the entrance with their powerful artillery creating a "Triangle of Fire" to thwart any invasion attempt by sea.Fort Worden, on the Quimper Peninsula, at the extreme northeastern tip of the Olympic Peninsula, sits on a bluff near Port Townsend, anchoring the northwest side of the triangle.The three posts were designed to prevent a hostile fleet from reaching such targets as the Puget Sound Naval Shipyard and the cities of Seattle, Tacoma and Everett.