Mounted Union reenactors drill during ongoing activities commemorating the 150th anniversary of the Battle of Gettysburg, Thursday, June 27, 2013, in Gettysburg, Pa. Union forces turned away a Confederate advance in the pivotal battle of the Civil War fought July 1-3, 1863, which was also the war�s bloodiest conflict with more than 51,000 casualties. (Photo by Matt Rourke/AP Photo)
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