Organized at Rochester, N. Y., and mustered in by Companies as follows: Companies "A" and "B" August 29, Company "C" September 11, Company "D" September 12, Company "E" October 18, Company "F" October 20, Companies "G" and "H" December 7, Companies "I" and "K" December 21, 1863; Company "L" January 8, and Company "M" at Elmira, N. Y., January 17, 1864. Companies "A," "B," "C," "D," "E" and "F" ordered to New York October 13, 1863, and assigned to garrison duty in New York Harbor till April 23, 1864. Companies "G" and "H" ordered to Fort Hamilton, New York Harbor, December 8, 1863. Companies "I" and "K" to Fort Richmond, New York Harbor, December 24, 1863. Companies "L" and "M" to Fort Richmond January, 1864, and duty at these points till April 23, 1864. Ordered to join Army of the Potomac in the field April 23, 1864. Attached to Provisional Brigade, 1st Division, 9th Army Corps, Army of the Potomac, to June, 1864. 3rd Brigade, 1st Division, 9th Army Corps, to June 1, 1864. 2nd Brigade, 1st Division, 9th Army Corps, to September, 1864. 3rd Brigade, 1st Division, 9th Army Corps, to June, 1865. 1st Brigade, Hardin's Division, 22nd Army Corps, Dept. of Washington, D. C., to August, 1865.

SERVICE:
Rapidan Campaign May-June, 1864. Battles of the Wilderness May 5-7. Spottsylvania May 8-12. Spottsylvania Court House May 12-21. North Anna River May 23-26. Line of the Pamunkey May 26-28. Totopotomoy May 28-31. Cold Harbor June 1-12. Bethesda Church June 1-3. Before Petersburg June 16-18. Siege of Petersburg June 16, 1864, to April 2, 1865. Mine Explosion, Petersburg, July 30, 1864. Weldon Railroad August 18-21. Poplar Springs Church September 29-October 2. Reconnoissance on Vaughan and Squirrel Level Roads October 8. Boydton Plank Road, Hatcher's Run, October 27-28. Fort Stedman March 25, 1865. Appomattox Campaign March 28-April 9. Assault on and fall of Petersburg April 2. Occupation of Petersburg April 3. Moved to South Side Railroad and duty at Ford's Station till April 20. Moved to Washington, D. C., April 20-27, and duty there till August. Grand Review May 23. Mustered out August 26, 1865.
Regiment lost during service 6 Officers and 220 Enlisted men killed and mortally wounded and 2 Officers and 299 Enlisted men by disease. Total 527.