William F. Fox, Lt. Col. U. S. V., Regimental Losses in the American Civil War, 1861-1865: A Treatise on the extent and nature of the mortuary losses in the Union regiments, with full and exhaustive statistics compiled from the official records on file in the state military bureaus and at Washington

The regiments of the Indiana Cavalry did not sustain all their losses while in the mounted service. The 8th Cavalry served originally as the 39th Infantry, and part of its losses in battle occurred while in the infantry service. It fought as infantry at Shiloh and Stone's River, its casualties in the latter action amounting to 30 killed, 119 wounded,¹ and 231 missing; total, 380. It was changed to mounted infantry in April, 1863, and to the 8th Cavalry in October, 1863. The 6th Cavalry also sustained part of its losses before it joined the mounted service, it having served originally as the 71st Infantry, during which it fought at Richmond, Ky., where it lost 29 killed, 91² wounded, and 593 missing and captured.

The 21st Infantry was changed to heavy artillery in March, 1863. Previous to that time it had sustained some heavy losses while acting as infantry, its casualties at the battle of Baton Rouge aggregating 24 killed, 98³ wounded, and 4 missing; total, 126.