At the Battle of Gettysburg, Longstreet's Corps arrived late on the first day, July 1, 1863. General Lee planned an assault for the second day that would feature Longstreet's Corps attacking northeast up the Emmitsburg Road into the Union left flank. Hood was dissatisfied with his assignment in the assault because it would face difficult terrain in the boulder-strewn area known as the Devil's Den. He requested permission from Longstreet to move around the left flank of the Union army, beyond the mountain known as , to strike the Union in their rear area. Longstreet refused permission, citing Lee's orders, despite repeated protests from Hood. Yielding to the inevitable, Hood finally gave in and his division stepped off around 4 p.m. on July 2, but a variety of factors caused it to veer to the east, away from its intended direction, where it would eventually meet with Union forces at Little Round Top. Just as the attack started, however, Hood was the victim of an artillery shell exploding overhead, severely damaging his left arm, which incapacitated him (although the arm was not amputated). His ranking brigade commander, Brig. Gen. Evander M. Law, assumed command of the division, but confusion as to orders and command status dissipated the direction and strength of the Confederate attack, significantly affecting the outcome of the battle.