As the V corps moved forward slowly, Warren became concerned about the safety of his left flank. He directed Crawford's division to move south along a farm track to Old Church Road, where they erected simple breastworks. Crawford sent forward the brigade of Col. Martin Davis Hardin, men of the Pennsylvania Reserves whose enlistments were due to expire that day. Rodes's men marched directly into Hardin's brigade at about noon and routed them. Crawford's entire division formation collapsed, exposing the V Corps' left flank. Unfortunately for the Confederates, Rodes lost control of his men, who ran beyond their objectives and descended into confusion. Warren began shifting his corps to face south toward Early.