Around 3 p.m., with the bulk of their force present, the Confederates commenced skirmishing, probing the defense maintained by Brig. Gen. Martin D. Hardin's division of the XXII Corps with a line of skirmishers backed by artillery. Near the start of the Confederate attack the lead elements of the VI and XIX Corps arrived at the fort, reinforcing it with battle-hardened troops. The battle picked up around 5 p.m. when Confederate cavalry pushed through the advance Union picket line. A Union counterattack drove back the Confederate cavalry and the two opposing lines confronted each other throughout the evening with periods of intense skirmishing. The Union front was aided by artillery from the fort, which shelled Confederate positions, destroying many houses that Confederate sharpshooters used for protection.