The 29th USCI was present during the Battle of Weldon Railroad on 18–21 August 1864. From September–December 1864, the 29th USCI served in the 2nd Brigade, 3rd Division, IX Corps. During this period, the regiment saw action at the Battle of Poplar Grove Church on 29–30 September and the Battle of Boydton Plank Road on 27–28 October. The unit transferred to the 3rd Brigade, 2nd Division, XXV Corps in December. The XXV Corps was a new formation that consisted of all the African-American troops involved in the campaign. The 31 December 1864 order of battle showed the 29th USCI under Major Brown serving in Colonel Henry C. Ward's brigade, Brigadier General William Birney's division, and Major General Godfrey Weitzel's corps. The regiment was brigaded with the 28th and 31st USCI.