The regiment was in action at West Point, and at Gaines Mill, its loss being over 200 killed and wounded. Their straw hats stood out on the battlefield, making them targets for Confederate guns. The regiment was present through the remainder of that week of battle, but was not closely engaged, then encamped at Harrison's Landing until August 16, 1862, when it returned for a brief period to Alexandria. In the Battle of Crampton's Gap it was in the van and lost heavily; was held in reserve at Antietam; at Fredericksburg was posted on picket duty, and after the battle went into winter quarters near Falmouth. It shared the hardships and discomforts of the Mud March under Burnside and was active in the Battle of Chancellorsville, with a loss at Salem Church of 20 killed, 87 wounded and 49 missing. A few days were next spent at Banks' Ford, then a short time in the old camp at Falmouth, and on May 22, 1863, the regiment was mustered out at Albany. During its term of service, its loss was 112 men killed or mortally wounded and 84 deaths from other causes. The three years men were transferred to the 121st New York.