Workers move a Civil War cannon into position at Fort Moultrie on Sullivans Island, S.C., on June 10, 2013 after the gun was conserved. The fort, part of the Fort Sumter National Monument and from

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Workers move a Civil War cannon into position at Fort Moultrie on Sullivans Island, S.C., on June 10, 2013 after the gun was conserved. The fort, part of the Fort Sumter National Monument and from which Confederate gunners fired at Sumter in Charleston Harbor to open the Civil War in 1861, recently conserved 10 large cannon. The National Park Service is using computer sensors to monitor the temperature and humidity inside the guns. (AP Photo/Bruce Smith) less 

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Associated Press
Mon, Jun 17, 2013 12:45 PM EDT