The Randall collection includes 77 wartime letters written by Randall over the full course of his service, from 7 September 1862 to 30 April 1865. With one exception, the letters are addressed either to Randall's father or to his father and stepmother. Taken as a whole, they provide only an imperfect record of Randall's wartime movements, as they tend to have survived in chronologically approximate groups, broken by gaps of months or more. The earliest of the letters was written from Camp Toledo in Ohio, where the 100th was organized. There follows a sequence of 33 letters (September and December, 1862; March and May to August, 1863) written mostly from central Kentucky; during this time the 100th was occupied with garrison duty and the occasional pursuit of Confederate "raiders." In August and September of 1863 the regiment, now attached to XXIII Army Corps, participated in its first major campaign: Ambrose Burnside's advance south through the Cumberland Mountains into eastern Tennessee. Randall's last letter from Kentucky was written on 20 August 1863 near Crab Orchard: "We have started on our great march over the mountains and have marched 2 days since one day was the hardest day I ever marched."