Fort Pulaski National Monument is located between Savannah and Tybee Island, Georgia. It preserves Fort Pulaski, where in 1862 during the American Civil War, the Union Army successfully tested a rifled cannon, the success of which rendered brick fortifications obsolete. The fort was also used as a prisoner-of-war camp. The National Monument includes most of Cockspur Island (containing the fort) and all of adjacent McQueens Island.