Organized in Indianapolis, July 29, 1861, arriving at Washington on the 5th of August. After some service in the field it went into winter-quarters at Fort Craig, on Arlington Heights, Va., remaining there until March, 1862, when it joined in the general advance of the Army. It then formed part of Gibbon's (4th) Brigade, Hatch's (1st) Division, McDowell's Corps, a brigade which afterwards became famous as the "Iron Brigade of the West." Its first battle was at Manassas, in which the Nineteeeth lost 47 killed, 168 wounded, and 44 missing, a total of 259 out of 423 engaged. Major Isaac M. May was killed in that battle. At South Mountain the casualties were 9 killed, 37 wounded, and 7 missing; at Antietam, 13 killed, and 59 wounded; at Gettysburg, 27 killed, 133 wounded, and 50 missing; and in Grant's campaign— from May 5 to July 30, 1864— it lost 36 killed, 1 74 wounded, and 16 missing. Lieutenant-Colonel Alois O. Bachman was killed at Antietam, and Colonel Williams fell at the Wilderness. The regiment took about 200 men into action at Antietam, and 288 at Gettysburg, the percentage of loss in each action being unusually heavy The First Corps was broken up in March, 1864, and its regiments transferred to the Fifth; Wadsworth's Division thus became the Fourth Division of the Fifth Corps; the Iron Brigade (1st Brig.), General Cutler commanding, remained in the division. While in the Fifth Corps, the regiment saw some hard fighting at the Wilderness, and, also, at the assault on Petersburg, June 18th. The enlistment of the Nineteenth expired in August, 1864, when the few remaining members of the original regiment went home.