This week marks the 150th anniversary of the Battle of Gettysburg, the bloodiest conflict ever on American soil. In three days of fighting — July 1-3, 1863 — between 46,000 and 51,000 soldiers from the Union and Confederate armies became casualties of the Civil War. Strategically, it was a battle that turned the tide of war.

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This photo was snapped 100 years ago in 1913 at Gettysburg during a 50-year commemorative celebration. Pictured are two old soldiers — one Union and one Confederate — shaking hands (via the Library of Congress):

Remembering Gettysburg