The thread has been a little bit sidetracked (and I've contributed to that) by discussion of Archie Clements. However, I promised to make an inquiry about the possibility of Archie's signature on a militia roster. There is no word yet on the existence of a militia roster, but the head of the Lafayette Historical Society reports this about Archie's last hours:
"Archie had indeed come to town to turn himself in however he changed his mind when he got here and instead went to the City hotel and got drunk. The City hotel was at 10th and Franklin Street. Archie's horse was in a livery Barn at 9th and Franklin Street. He went and retrieved his horse but meanwhile the Union Soldiers had organized themselves on the second floor of the Lafayette County Courthouse waiting for him to emerge from The Livery Barn. When he did they opened fire and he finally fell off of his horse in front a house a few blocks down Franklin Street. When they reached him they found 30 holes from bullets in him and his horse. Apparently the horse gave out before Archie did. Archie was horribly wounded in his normal shooting arm and was trying to cock his revolver with his teeth. His last words were 'I told you I'd never surrender'."
I take it from this that, even if a roster is found, we probably won't see Archie's signature on it.
In response to
James N (just above), yes, I think we can safely assume Quantrill was an opportunist, just as you say.