I assume by "TM" you are referring to Trans-Mississippi? I will act on that assumption with what follows.

Some of us got into this on "The Missouri in the Civil War Message Board" in some manner or other, but in truth a number of non-surrendered and non-paroled Missouri southerners in the spring of 1865 took advantage of "the Arkansas plan." The Arkansas plan was initiated in early May 1865 by Union Major General Grenville Dodge, commander of the Dept. of the Missouri, in that he sent inquiries to the acting Arkansas troop commander, Brigadier General M. Jeff Thompson of the southern Missouri State Guard. General Thompson showed some interest in what Dodge had to offer, and General Dodge's emissary, a lieutenant colonel of Dodge's staff, met with General Thompson and in effect offered the same terms General Grant offered to General Lee in Virginia on 9 April. General Thompson's prewar experience as a trial lawyer in St. Joseph, MO came in handy here, and he was careful to ask many questions and obtain some terms and guarantees to benefit his men over a period of a few days before he agreed and became the first soldier to take the oath and sign the paper. Those terms were that any remaining Confederate troops needed to:
--go to one of the agreed-upon sites in Arkansas;
--surrender their firearms, ammunition, and horse (unless the horse was the soldier's private property);
--swear an oath of allegiance to the United States or that they would not again bear arms against it (I'm fuzzy on the exact wording.);
--sign a parole paper which would be also signed by a Union officer and carry away a copy for the parolee's protection, while the second copy would be retained by the Union military.
Upon completion of these steps the former southern combatant could go home or anyplace of his choosing, and start life anew. I got this from the "Official Records."

Many Missourians, including guerrillas as well as regular southern soldiers, living in southeast Missouri were favorably impressed with the humanity of the surrender terms, and rode or walked to the surrender site nearest them, which was Wittsburg in northeast Arkansas.

This was not without controversy, because civil authorities could still apprehend and try guerrillas for civil crimes they committed while in irregular Confederate service, but I don't know how many faced that fate. Further, just as in "The Outlaw Josey Wales" Clint Eastwood movie, there was one group of about 12 parolees, including several from Wayne County, MO who were captured by an unidentified Union unit a few miles from Wittsburg and murdered despite having their copy of the parole paper. Also, there were some soldiers in Arkansas who were not part of General Thompson's command, and I think they worked out some kind of provision for their surrender, too.

Also, the Confederate Army of Tennessee, which contained many soldiers from the Trans-Mississippi region never surrendered, and after the terrible battles of Franklin and Nashville, simply walked home carrying their rifles and personal gear. I am familiar with one Missouri Confederate family who questioned the "took his rifle home with him" part in a family reunion a few years ago, whereupon a cousin remembered hearing that their ancestor did indeed bring his rifle-musket to the home place. The part of the family still living on the home place found this unlikely, and the cousin offered that he was told as a child the old rifle was placed in the springhouse, because soon after the war the technological advances in metallic cartidge casings as well as magazine and breech-loading weapons rendered the faithful old war gun to obsolescence, even for squirrel hunting. Sure enough, the other group looked anew into the springhouse and there it was! Or, what little was left of it. True story.

Many of the Confederates who were serving in or near Louisiana that spring worked through surrender proceedings at Shreveport, if I read correctly. I do not know what those Texans did, however.

Bruce Nichols