Mustered in at Camp Butler, near Springfield, Ill., August 2,, 1862, and ordered immediately on active duty in Kentucky. It assisted in covering the retreat after the battle of Richmond, Ky., and participated in other movements along the line between Louisville and Cincinnati. It was assigned to Sheridan's Division, and fought under that distinguished general until he was ordered to the East in the spring of 1864. Colonel Ber nard Laiboldt, of the Second Missouri, commanded the brigade· The Seventy-third was engaged at the battle of Chaplin Hills (Perryville), where it lost 2 killed and 33 wounded. At Stone's River it lost ,6 killed, 64 wounded, and 8 missing; and at Chickamauga, 13 killed, 57 wounded, and 22 missing. Major William E. Smith lost his life in the latter action. The regiment fought at Missionary Ridge, losing there 3 killed and 24 wounded, after which it marched with its corps— the Fourth— to the relief of Knoxville, a campaign noted for its unparalleled hardships and privations. During the Atlanta campaign the regiment served in Kimball's (1st) Brigade, Newton's (2d) Division, Fourth Corps, participating in all the battles of that command. After the fall of Atlanta it marched northward with the corps in pursuit of Hood, fighting in the bloody engagement at Franklin. In that battle the division was under the command of General Wagner. The brigade, under com mand of Colonel Emerson Opdycke (One Hundred and Twenty-fifth Ohio), played an important part in that battle, its gallantry aiding materially in saving the day. The Seventy-third fought its last battle at Nashville, where it joined in the successful bayonet charge of the second day's fight. The regiment then joined in the pur suit of Hood's Army, and proceeding to Huntsville, Ala., went into winter quarters there. In April, 1865, it moved to East Tennessee, and thence to Nashville, where it was mustered out June 12, 1865.