Text source: HA.com John William Peck, 4th Indiana Cavalry, Archive of Letters.A fantastic group of over 100 war-dated letters by 2nd Lieutenant John W. Peck.
8th Missouri Infantry soldier writes just before Shiloh
From HA.com (text source below) Lt. Col. James Peckham, 8th Missouri Infantry James Peckham was a Unionist from St. Louis and member of the Missouri legislature

51st Ohio soldier asks, “what are we fighting for?” January 1864
Moses L. Whittemore of the 51st Ohio Volunteers: born to Daniel P. Whittemore and Lavina (sometimes Lovina) Goodhue Whittemore in Keene, OH, Moses Langley Whittemore

36th Illinois soldier writes of Battle of Stone’s River
Freeman S. Dunklee of the 36th Illinois Infantry, Co. A, pens three letters recounting the Battle of Murfreesboro, where he was wounded and taken prisoner, and where
76th Ohio soldier letter, Atlanta campaign
Source: Fall/Winter 2018 catalog of Brian Green 76th OHIO INF./ ATLANTA CAMPAIGN. ALS, 2pp., 4to., onthe eld near Atlanta, Ga. 8/5/64. Soldier (Humphrey) writes mother
85th New York Infantry soldier writes of Battle of Fair Oaks
From Fall/Winter catalog of Brian Green 85th N.Y. INF. ALS, 15 1/3pp., 8vo., Camp near Oakwood Swamp 6/25/62 pert to Battle of Fair Oaks. Soldier