Revolutionary War Swivel Gun Shot Dug at Mt. Independence

Mount Independence on Lake Champlain in Orwell, Vermont, was the site of extensive fortifications built during the American Revolutionary War by the American army to stop a British invasion. Construction began in July 1776, following the American defeat in Canada, and continued through the winter and spring of 1777. After the American retreat on July 5 and 6, 1777, British and Hessian troops occupied Mount Independence until November 1777.
 
1.5 in. across and weighs 8 oz.  Marked MI.