This ledger, entitled Register of Muster-In and Muster-Out of U. S. Colored Troops During the Rebellion of 1861, contains muster-in records for Batteries A, B, C, D, F, G, H, I, K, and L of the 1st Battalion of the 3rd Heavy Artillery and muster-out records for Battery A. Batteries A, B, C, D, G, I, K, and M mustered in at Memphis, Tennessee, while Batteries F, H, and L mustered in at Fort Pickering, Tennessee. All of the musters-in took place in 1863, and Battery A mustered out in Memphis in 1865 (although the official report was not completed until 1866). The ledger itself is an elephant folio with leather corners and tooled leather accents.