Fort Casey

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Fort Casey State Park is located on Whidbey Island in Washington state. Admiralty Inlet was considered so strategic to the defense of Puget Sound in the 1890s that three forts, Fort Casey on Whidbey Island, Fort Flagler on Marrowstone Island, and Fort Worden, were built at the entrance with huge guns creating a "Triangle of Fire" that could theoretically thwart any invasion attempt by sea. Fort Casey is now a 467-acre marine camping park. The Admiralty Head Lighthouse is located in the state park.

Fort Casey was built about 1908. Over the next several years, the fortifications were supplemented by newer batteries with guns on disappearing carriages, which could be raised out of their protective emplacements so that the guns were exposed only long enough to fire. In addition, more advanced rapid-fire gun batteries were added. The fort's batteries became obsolete almost as soon as they were finished. Battleships were designed with increasingly bigger and more accurate guns, and the static strategies of the nineteenth century were replaced with more mobile attack systems in the twentieth century. Most of the guns and mortars were removed from the fort and sent to Europe during World War I, where they were mounted on railcars to serve as mobile heavy artillery.

In 1935, the Coast Artillery withdrew the station's battery assignments placed it on inactive status. As World War II approached, military officials reactivated the station after making physical improvements to the aging frame-plaster construction.