[Footnote: On the morning of the 12th, Hancock's corps, hidden by a dense fog, charged upon the Confederate line, broke the abattis, surrounded a division, and took three thousand prisoners, including two generals. So complete was the surprise, that the officers were captured at breakfast. Lee, however, rallied, and the fighting was so fierce to regain this lost position, that "a tree eighteen inches in diameter was cut in two by the bullets which struck it. Ten thousand men fell on each side. Men in hundreds, killed and wounded together, were piled in hideous heaps, some bodies, which had lain for hours under the concentric fire of the battle, being perforated with wounds. The writhing of the wounded beneath the dead moved these masses at times; while often a lifted arm or a quivering limb told of an agony not quenched by the Lethe of death around."] [Footnote: It was during this terrible battle that Grant sent his famous despatch, "I propose to fight it out on this line if it takes all summer."] BATTLE OF COLD HARBOR (June 3).--Lee, however, moving on the inner and shorter line, reached the _North Anna_ first. Here some severe fighting occurred, when, Grant moving to flank again, Lee slipped into the intrenchments of Cold Harbor. At daybreak a general assault was made. "Twenty minutes after the first shot was fired, ten thousand Union men were stretched writhing on the sod or still and calm in death, while the enemy's loss was little over one thousand." The army, weary of this useless slaughter, refused to continue the attack.