Fort Pulaski National Monument is located on Cockspur Island between Savannah and Tybee Island, Georgia. It preserves Fort Pulaski, where in 1862 during the American Civil War, the Union Army successfully tested rifled cannon in combat, 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.