On May 6, Hancock's II Corps attacked Hill at 5 a.m., overwhelming the Third Corps with the divisions of Wadsworth, Birney, and Mott; Getty and Gibbon were in support. Lee had assured Hill that Longstreet's Corps would arrive to reinforce Hill before dawn, but moving cross-country in the dark, they made slow progress and lost their way at times. Ewell's men on the Turnpike had attacked first, at 4:45 a.m., but continued to be pinned down by attacks from Sedgwick's and Warren's corps and could not be relied upon for assistance. Before a total collapse, however, reinforcements arrived at 6 a.m., Brig. Gen. John Gregg's 800-man Texas Brigade, the vanguard of Longstreet's column. General Lee, caught up in the excitement, began to move forward with the advancing brigade. As the Texans realized this, they halted, refusing to move forward unless Lee remained in the rear.