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Mounted Union re-enactors drill during ongoing activities commemorating the 150th anniversary of the Battle of Gettysburg in Gettysburg, Pa., June 27, 2013.
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.
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Members of the Union Murray's Brigade set up camp under threatening skies during ongoing activities commemorating the 150th anniversary of the Battle of Gettysburg June 27, 2013.
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A Confederate re-enactor walks in a rainstorm in Gettysburg, Pa., June 27, 2013.
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Re-enactors portraying Union soldiers in the Murray's Brigade cook their rations during ongoing activities commemorating the 150th anniversary of the Battle of Gettysburg at Bushey Farm in Gettysburg, Pa., June 27, 2013.
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David Dunn of Dallas, with the Confederate 9th Texas Infantry, takes a drink from his mug June 27, 2013.
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Roxanne Ramirez of Georgetown, Texas, and Robert Stripay of Sugarland, Texas, both with the Confederate Red River Battalion, meet in Gettysburg, Pa., June 27, 2013.
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Shoppers view goods in one of the many tents selling items and souvenirs, such as replica Civil War-era boots, at Bushey Farm in Gettysburg, Pa., June 27, 2013.
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Re-enactors portraying Confederate soldiers in the 9th Texas Infantry view the Pickett's Charge field in Gettysburg, Pa., June 27, 2013.
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Shoppers walk in and out of tents at Bushey Farm during ongoing activities commemorating the 150th anniversary of the Battle of Gettysburg in Gettysburg, Pa., June 27, 2013.
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A typical Civil War-era Union coffee ration is displayed during ongoing activities commemorating the 150th anniversary of the Battle of Gettysburg in Gettysburg, Pa., June 27, 2013.
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Members of the 4th Maryland Light Artillery unload their weapon in the artillery park in Gettysburg, Pa., June 27, 2013.
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Mike Wilkinson of San Antonio, seen with his son Zach, with the 4th Texas Infantry, smokes a pipe during ongoing activities commemorating the 150th anniversary of the Battle of Gettysburg in Gettysburg, Pa., June 27, 2013.
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Tripp McMillan of Overland Park, Kan., portraying a Confederate soldier in the 9th Texas Infantry, views the Pickett's Charge field in Gettysburg, Pa., June 27, 2013.
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A shopper views goods and souvenirs for sale at Bushey Farm during ongoing activities commemorating the 150th anniversary of the Battle of Gettysburg in Gettysburg, Pa., June 27, 2013.
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Members of the Union Murray's Brigade set up camp during ongoing activities commemorating the 150th anniversary of the Battle of Gettysburg in Gettysburg, Pa., June 27, 2013.
Matt Rourke/AP
A member of the Union Murray's Brigade lights his pipe at Bushey Farm in Gettysburg, Pa., June 27, 2013.
Matt Rourke/AP
Union re-enactors seek shelter from a driving rainstorm under a trailer during ongoing activities commemorating the 150th anniversary of the Battle of Gettysburg in Gettysburg, Pa., June 27, 2013.
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Cindy Westbroek of Clearfield, Utah, rides her horse at Bushey Farm during ongoing activities commemorating the 150th anniversary of the Battle of Gettysburg in Gettysburg, Pa., June 27, 2013.
Matt Rourke/AP
People visit Pickett's Charge field during ongoing activities commemorating the 150th anniversary of the Battle of Gettysburg in Gettysburg, Pa., June 27, 2013.