When the VI Corps advanced to Gibbon's left at the start of the attack on Fort Gregg, only Confederate artillery fire from Lieutenant Colonel William T. Poague's Battery, directed by Confederate staff officer Giles Buckner Cooke opposed them. The battery was operating from a position next to Lee's command post at the Turnbull House, also known as Edge Hill, located west of Rohoic Creek in front of the Dimmock Line. Getty's division had moved near the Turnbull House with limited protection from Poague's artillery. Getty determined to attack the 13 guns that were turned against his division from that location. Getty's first attack was turned back by heavy canister fire from the 13 guns. Getty then directed Colonel Edwards brigade to attack the artillery with an assault on its right flank while Colonel Hyde's brigade would attack on the left and front. Hyde's men successfully outflanked the batteries, leading to the withdrawal of the gunners and the 9 guns that had not been immobilized. Field's division occupied the Dimmock Line as the Confederate artillerists fled the Turnbull House, while General Lee also rode from the Turnbull House to the protection of the Dimmock Line as VI Corps infantrymen approached close enough to see him leave. After the Confederates evacuated Edge Hill, it was occupied by five VI Corps brigades that evening. The VI Corps and XXIV Corps then formed a continuous line opposite the Dimmock works. Mott's division from the II Corps filled in on the Whitworth farm after Seymour's division was sent that evening to reinforce Parke's IX Corps.