Confederate Civil War re-enactors stage an artillery attack on the 150th anniversary of the historic Battle of Gettysburg, in Gettysburg, Pennsylvania, on July 2, 2013. The battle, which took place July 1-3, 1863, is widely considered the turning point in the American Civil War in favor of the Union. Federal and Confederate armies suffered a combined total of 51,000 casualties over three days, the highest number of any battle in the four-year war. (Photo by John Moore/Getty Images)
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