From May 31-June 12, 1864, more than 160,000 men clashed at Cold Harbor, Virginia, during the Wilderness Campaign. The 2nd, 5th, 6th, 7th and 36th Wisconsin Infantry regiments took part. By June 5, each side was getting weary. "I can not tell you how tedious and trying this campaign has become," wrote Rufus Dawes, colonel of the 6th Wisconsin Infantry, to his wife. "Thirty days of toil, danger and bloodshed [since the Wilderness Campaign began], and we can see yet small prospect of an end to it… Our casualties in the regiment now amount to one hundred and seventy men killed and wounded."