Volunteers portraying Union artillery troops gather before performing a cannon firing demonstration at Antietam National Battlefield in Sharpsburg, Md., Monday, Sept. 17, 2012. A series of demonstrations and speeches took place at the battlefield to commemorate the 150th anniversary of the Civil War's Battle of Antietam. (AP Photo/Patrick Semansky)

Associated Press
Volunteers portraying Union artillery troops gather before performing a cannon firing demonstration at Antietam National Battlefield in Sharpsburg, Md., Monday, Sept. 17, 2012. A series of demonstrations and speeches took place at the battlefield to commemorate the 150th anniversary of the Civil War's Battle of Antietam. (AP Photo/Patrick Semansky)
Volunteers portraying Union artillery troops gather before performing a cannon firing demonstration at Antietam National Battlefield in Sharpsburg, Md., Monday, Sept. 17, 2012. A series of demonstrations and speeches took place at the battlefield to commemorate the 150th anniversary of the Civil War's Battle of Antietam. (AP Photo/Patrick Semansky)
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