The Confederate Army reaches the Potomac, but high water levels make the river unfordable for the foreseeable future. General Robert E. Lee orders the construction of a defensive line to cover Williamsport and Falling Waters. The Union Army marches from Gettysburg to Frederick and Middletown, Maryland, before crossing South Mountain. Meade receives a promotion and news of General Ulysses S. Grant's victory at Vicksburg. Rebel and Yankee cavalry clash at the Battle of Boonsboro and the Battle of Funkstown.

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