Capt. William Christopher Bryan - Military service?

I'm trying to establish the exact nature of WCB's military service. He is often listed as "Captain", but what he was captain of, is unclear. "Captain" of Fort Bryan? Did he hold any military rank, either with a militia or with the Continental Army? Are there any known records of him in the military rolls of the time, or perhaps military pension awarded to his widow? I know that Kentucky was not yet a state, but that frontier outposts served the Revolutionary cause as well.

Any information one might be able to share would be greatly appreciated.