Marcus M. Landers was enlisted in Scanlan's or Scanland's Squadron at Ft Arbuckle for 3 years by Mercer Fain on 18 Nov1861. The unit was generally assigned to the protection and logistical support of the Confederate Indians in the Indian Territory,and had been recruited " exclusively for frontier defense" although it was a regular CSA unit. Many of it's members(about half) were refugees who had escaped from Yankee held CO and other western states.In Feb,1863, It became Co. A of Well's Bn, but with essentially the same job which was part of Gen Douglas Cooper's command of Indian troops with some Whites. They fought at Prairie Grove in Dec. 1862 and Honey Springs in July 1863. Generally Co. A was either at or split between Ft Belknap and Arbuckle until the Fall of 1864 when they were absorbed in the enlarged Well's Regiment which finally surrendered at Hempstead, Tx in 1865.The rest of the Regiment fought from NE Okla and MO to LA during this time with the main Trans-Mississippi Army. Lander's name does not appear on the later rolls of Well's Regiment, so it is likely he left the Army when his enlistment ran out in Nov 1864.
I hope this is useful to you.
Earl Pittman