The Corps d'Afrique were only the following regiments:
1st and 2nd Brigade Marching Bands, Corps d'Afrique (later made into Nos. 1 and 2 Bands, USCT).
1st Regiment of Cavalry (1st Corps d'Afrique Cavalry, later made into the 4th US Colored Cavalry).
22 Regiments of Infantry (1st–20th, 22nd, and 26th Corps d'Afrique Infantry, later converted into the 77th–79th, 80th–83rd, 84th–88th, and 89th–93rd US Colored Infantry on April 4, 1864).
5 Regiments of Engineers (1st–5th Corps d'Afrique Engineers, later converted into the 95th–99th US Colored Infantry regiments on April 4, 1864).<-----
1 Regiment of Heavy Artillery (later converted into the 10th US Colored (Heavy) Artillery on May 21, 1864).
Peter was in the 1st Regiment of Engineers, Co "F"
https://www.wikitree.com/photo/jpg/Profile_Photo_s-364
If you look at the original card for Peter it tells you in Red to see Peter Godan, but you can plainly see its spelt Gordon and also there is a cross next to his first name and his rank.
If you look at the drawing image of Peter in uniform you will see he has Corporal stripes not Sergeant.
https://www.wikitree.com/photo/jpg/Unknown-465826-2
Furney Bryant's first rank was Corporal and then final rank Sergeant. He was seconded on attachment to New York and was with Vincent Coyler.
https://www.tandfonline.com/doi/abs/10.1080/14664658.2014.939807?scroll=top&needAccess=true&journalCode=fanc20
The exploits of Furney Bryant were written as Peter Gordons.