July 1, 1863 – The largest military conflict in North American history begins when Union and Confederate troops collide at Gettysburg.
This battle was considered a turning point for both sides, and involved the most casualties of the entire war. The initial contact occurred on July 1, and by July 2 most of the armies were assembled and had started the battle.
After three days of heavy assaults on the Confederates, Robert E. Lee led his remaining men to retreat back to Virginia.
The two armies suffered between 46,000 and 51,000 casualties.
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