center, watched for an opening to attack there as well. Hancock's II Corps advanced across the Po, but he delayed his attack until the morning. This error was fatal to Grant's plan. That night, Lee moved two divisions of Jubal Early's corps from Spotsylvania Court House into position against Hancock. On the morning of May 10, Grant ordered Hancock to withdraw north of the Po, leaving a single division in place to occupy the Confederates in that sector, while the rest of his army was to attack at 5 p.m. across the entire Confederate line. At 2 p.m., Jubal Early decided to attack the division, which retreated across the Po without being captured, destroying the bridges behind them. While Hancock was in the Po sector, Warren requested permission from Meade to attack Laurel Hill at 4 p.m., uncoordinated with the rest of Grant's attack. Again the Laurel Hill line repulsed the Union troops with heavy losses. Grant was forced to postpone his 5 p.m. coordinated assault until Warren could get his troops reformed. Not informed of the delay, Brig. Gen. Gershom Mott of the II Corps moved his division forward at 5 p.m. toward the tip of the Mule Shoe. When his men reached the open field, Confederate artillery ripped them to shreds, and they retreated. At around 6 p.m., Col. Emory Upton led a group of 12 hand-picked regiments, about 5,000 men in four battle lines, against an identified weak point on the west side of the Mule Shoe. The plan was for Upton's men to rush across the open field without pausing to fire and reload, reaching the earthworks before the Confederates could fire more than a couple of shots. The plan worked well initially, but Generals Lee and Ewell were quick to organize a vigorous counterattack with brigades from all sectors of the Mule Shoe. No Union supporting units arrived. Upton's men were driven out of the Confederate works, and he reluctantly ordered them to retreat. Despite his reverses on May 10, Grant had reason for optimism because of the partial success of Upton's innovative assault. He planned to use the same tactics with Hancock's entire corps. On the Confederate side, Lee received some intelligence reports that made him believe Grant was planning to withdraw toward Fredericksburg. If this happened, he wanted to follow up with an immediate attack. Concerned about the mobility of his artillery to