I agree that the idiot of a Texas Ranger (McCollough) should and could have joined Ol Pap Price in a follow up after Wilson's Creek. Missouri was split politically but Lyon's "declaration of war" on a state which had not succeded had caused a lot of resentment in the state. Nobody at that time had good supply, it simply hadn't had dime to develop, but Missouri had good forage and sympathitic farmers. It was August and there were still a couple of months of good campaign weather left. I think that a vigorous pursuit would have strenghtined the
CS forces with recruits. Note, Price's troops at this point were not
CSA but Missouri State Guard resisting an illigal Federal invasion of a state that was not actually in rebellion. They would join the
CSA untill later, after the Missouri Articles of Succession were passed and Missouri accepted into the Confederacy. We should look at the successes Price had aginst Union Forces after Wilson's creek which shows that a campaign was not only possible but effective. McColough's forces could have given the added boost necessry to possibly take St. Louis snd saecure the lower Mississippi River for the
CS. This also would have given them control of the Missouri River. A real advantage in the "Steamboat War."
There were several factors at work which prevented McCollough from cooperating with Price. First and formost the two couldn't stand each other, a condition which would persist to the detrament of the
CS until McCollough's death at Pea Ridge the following March. Second, there was no real political
CS organization in the area yet. The Confederate department of the Trans Mississippi didn't yet exist. McCollough's forces were more a collection of co-operating state militia units rather than a
CS Army. McCollough was a Texas Ranger not an army product. he had contempt for trained officers, which hurt him. He was pritty capable on a tactical level, but I beleive he was unable to grasp the larger stratigic picture. Price was a much better general. McCollough used as his excuse for not entering Missouri a concern that he would be invading the United States.
I personaly think that the failure to secure Missouri was a large factor in the loss of the war.
As for the color of sack coats at Wilson's Creek, it didn't make a whole lot of diffrence. There were all sourts of troops wearing all sorts of diffrent uniforms or none at all. Just like first Bull Run there were Yankees in Grey and Rebs in blue. And just like Bull Run there several "friendly fire" incidents.