I found another post from Bryan Howerton that confirms the connection between Coleman and the 46th Arkansas:

Re: guerillas, partisans, bushwhackers in the nortBy:Jay Tipton
Date: Thursday, 12 April 2007, 7:30 pm In Response To: guerillas, partisans, bushwhackers in the northern (joe smith) Joe, I hope this helps. McCleod's History of Lawrence County, and a couple of past issues of Lawrence County Historical Society Quarterly contain stories of bushwackers and irregulars operating in Lawrence County. In one account, a man was tortured by holding his feet in the fire. In another account a local Home guard/Militia unit composed of boys too young for service, men too old or to ill for service and soldiers home recuperating from wounds and illness was formed to protect the residents from the outlaws and bushwackers.
Thomas Freeman and W.O. Coleman operated in present day Sharp, Randolph, Lawerence and Fulton counties with Partisan Rangers, later soldiers from these units formed the backbone and leadership to the 45th and 46th Arkansas Calvary. It is noted that a significant number of men in Coleman's were from Missouri and were former members of the Missouri State Guard. The Official Records for the Trans-Mississippi Department has details of bushwackers and guerillas being captured during recons in force in the area of western Lawrence County. Coleman's and Freeman's units were the Confederate forces that the Union units were looking for when the Skirmish/Battle of Martin's Creek occurred, and a skirmish west of Smithville involved Coleman's troops.