Maj. Gen. J.E.B. Stuart's cavalry screened Gen. Robert E. Lee's Confederate infantry as it marched north in the Shenandoah Valley behind the sheltering Blue Ridge Mountains. The pursuing Union cavalry of Brig. Gen. Judson Kilpatrick's brigade, in the advance of Brig. Gen. David McM. Gregg's division, encountered Col. Thomas T. Munford's troopers near the village of Aldie, resulting in four hours of stubborn fighting.