After burning Chambersburg, Pennsylvania, on July 30, Johnson's and McCausland's cavalry brigades rode towards Cumberland, Maryland, to disrupt the B&O Railroad. Brig. Gen. Benjamin Kelly organized a small force of soldiers and citizens to meet the Confederate advance. On August 1, Kelly ambushed Rebel cavalrymen near Cumberland at Folck's Mill, and skirmishing continued for several hours. Eventually the Confederates withdrew.