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Frank Marron and Colleen Miller stand amidst luminaries marking Civil War graves at the Soldiers' National Cemetery on June 30, 2013 in Gettysburg, Pennsylvania. Hundreds of people gathered for the official Civil War ceremony marking the 150th anniversary of the Battle of Gettysburg. The battle is widely considered the turning point in the Civil War and a watershed moment in U.S. history. Union and Confederate armies suffered a combined total of up to 51,000 casualties over three days, the highest number of any battle in the four-year war.