The Battle of Monterey Pass began as Brig. Gen. Judson Kilpatrick's cavalry division arrived near Fairfield on July 4 just before dark. They easily brushed aside Brig. Gen. Beverly Robertson's pickets and encountered a detachment of 20 men from the Confederate 1st Maryland Cavalry Battalion, under Capt. G. M. Emack, that was guarding the road to Monterey Pass. Aided by a detachment of the 4th North Carolina Cavalry and a single cannon, the Marylanders delayed the advance of 4,500 Union cavalrymen until well after midnight. Kilpatrick was not able to see anything in the dark and considered his command to be in a perilous situation. He ordered Brig. Gen. George A. Custer to charge the Confederates with the 6th Michigan Cavalry, which broke the deadlock and allowed Kilpatrick's men to reach and attack the wagon train. They captured or destroyed numerous wagons and captured 1,360 prisoners—primarily wounded men in ambulances—and a large number of horses and mules.