At 7 a.m. Grant advised Meade to vigorously exploit any successful part of the assault. Meade ordered his three corps commanders on the left to assault at once, without regard to the movements of their neighboring corps. But all had had enough. Hancock advised against the move. Smith, calling a repetition of the attack a "wanton waste of life," refused to advance again. Wright's men increased their rifle fire but stayed in place. By 12:30 p.m. Grant conceded that his army was done. He wrote to Meade, "The opinion of the corps commanders not being sanguine of success in case an assault is ordered, you may direct a suspension of further advance for the present." Estimates of casualties that morning are from 3,000 to 7,000 on the Union side, no more than 1,500 on the Confederate.