The Union Army of the Potomac finally catches up to the Confederate Army of Northern Virginia at Williamsport, Maryland. With the rebels dug in in a series of defensive earthworks, Genera George Meade hesitates to attack and calls a Council of War of his top generals. After a brief respite from the heavy summer rains, General Robert E. Lee seizes the opportunity to begin the evacuation of his army across the Potomac River. Union cavalry under Generals Judson Kilpatrick and John Buford launch an attack on the Confederate rear guard at the Battle of Falling Waters.

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