 From Richmond the march was continued to Washington, D. C., where the regiment participated in the review of General Sherman's army on the 24th of May, and on the 8th of January was mustered out of service, when it proceeded to Michigan, arriving at Detroit on the 13th, and on the 22d was paid off and disbanded.The 21st participated in encounters with the enemy at Perryville, Ky., October 8, 1862; Lavergne, Tenn., December 27, 1862; Stewart's Creek, Tenn., December 29, 1862; Stone River, Tenn., December 29, 31, 1862, and January 1, 2, and 3, 1863; Tullahoma, Tenn., June 24, 1863; Elk River, Tenn., July 1, 1863; Chickamauga, Ga., September 19, 20, and 21, 1863; Chattanooga, Tenn., October 6, 1863; Brown's Ferry, Tenn., October 27, 1863; Mission Ridge, Tenn., November 26, 1863; Savannah, Ga., December 11, 18, 20, and 21, 1864; Averysboro, N. C., March 16, 1865; Bentonville, N. C., March 19, 11, 1865.The reports of the regiment show a membership of 1,477 officers and men.