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