had also subsided enough to be forded. Lee ordered a retreat to start after dark, with Longstreet's and Hill's corps and the artillery to use the pontoon bridge at Falling Waters and Ewell's corps to ford the river at Williamsport. On the morning of July 14, advancing Union skirmishers found that the entrenchments were empty. Cavalry under Buford and Kilpatrick attacked the rearguard of Lee's army, Maj. Gen. Henry Heth's division, which was still on a ridge about from Falling Waters. The initial attack caught the Confederates by surprise after a long night with little sleep, and hand-to-hand fighting ensued. Kilpatrick attacked again and Buford struck them in their right and rear. Heth's and Pender's divisions lost numerous prisoners. Brig. Gen. J. Johnston Pettigrew, who had survived Pickett's Charge with a minor hand wound, was mortally wounded at Falling Waters. This minor success against Heth did not make up for the extreme frustration in the Lincoln administration about allowing Lee to escape. The president was quoted as saying, "We had them within our grasp. We had only to stretch forth our hands and they were ours. And nothing I could say or do could make the Army move." The two armies did not take up positions across from each other on the Rappahannock River for almost two weeks. On July 16 the cavalry brigades of Fitzhugh Lee and Chambliss held the fords on the Potomac at Shepherdstown to prevent crossing by the Federal infantry. The cavalry division under David Gregg approached the fords and the Confederates attacked them, but the Union cavalrymen held their position until dark before withdrawing. The Army of the Potomac crossed the Potomac River at Harpers Ferry and Berlin (now named Brunswick) on July 17–18. They advanced along the east side of the Blue Ridge Mountains, trying to interpose themselves between Lee's army and Richmond. On July 23, in the Battle of Manassas Gap, Meade ordered French's III Corps to cut off the retreating Confederate columns at Front Royal, by forcing passage through Manassas Gap. At first light, French began slowly pushing the Stonewall Brigade back into the gap. About 4:30 p.m., a strong Union attack drove the Confederates until they were reinforced by Maj. Gen. Robert E. Rodes's division and artillery. By dusk, the poorly coordinated Union attacks were abandoned. During the night, Confederate forces withdrew into the Luray Valley. On July 24, the Union