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 Concerned about the mobility of his artillery to support the potential attack, he ordered that the guns be withdrawn from Allegheny Johnson's division in the Mule Shoe to be ready for a movement to the right. He was completely unaware, of course, that this was exactly the place Grant intended to attack. Johnson requested to Ewell that his artillery be returned, but somehow the order did not reach the artillery units until 3:30 a.m. on May 12, 30 minutes before Hancock's assault was planned to start.