As Lee's army retreated from Gettysburg, Brig. Gen Kilpatrick's 3rd Division, Cavalry Corps, caught up with the Confederate rearguard of Maj. Gen. Heth's division on a ridge at the Daniel Donnelly farm, 1.8 miles from the pontoon bridge the Army of Northern Virginia used to escape into Falling Waters, West Virginia.
Three days of fighting at Gettysburg, the loss of over 3000 men and eleven days of retreating had left Heth's division a shadow of it's former self. Worn out, most of Heth's men had stacked their arms, straggled to the Potomac to await their turn to cross the river or occupied the abandoned artillery lunettes atop the ridge.
When Union cavalry arrived on the scene their brigade commander, Brig. Gen. George. A. Custer ordered Companies B and F, 6th Michigan Cavalry to dismount and engage the enemy on the ridge. On his arrival, Kilpatrick countermanded Custer's order, ordering the squadron to mount, draw sabres and charge.
Partly obscured by morning mist, Maj. Weber led the Michigan cavalrymen's charge taking Brig. Gen.Pettigrew's and Col. Brochenbrough's brigades by surprise. Hastily forming ranks, the Confederate infantry managed to deliver a volley against the onrushing cavalry. Then confusion reigned as some Confederates panicked, surrendered or fled to the river, while others defiantly stood their ground.
The Michigan troopers were soon stopped by the sheer number of Confederate soldiers slowing their momentum. In minutes they'd lost 33 men killed, including Maj. Weber and another 36 wounded.
Among the Confederate casualties was Brig. Gen. Pettigrew, shot and mortally wounded while recovering in the barn, after being thrown by his horse.
The rest of the 6th Michigan joined the fight on foot, but couldn't prevent the rest of Heth's division retiring across the Potomac.

From Osprey Publishing's: The Battle of Gettysburg 1863 (3)

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