Stuart’s cavalry screened the Confederate infantry as it marched north behind the sheltering Blue Ridge. The pursuing Federals of Kilpatrick’s brigade, in the advance of Gregg’s division, encountered Munford’s troopers near the village of Aldie, resulting in four hours of stubborn fighting. Both sides made mounted assaults by regiments and squadrons. Kilpatrick was reinforced in the afternoon, and Munford withdrew toward Middleburg.