Are you talking about Harvey? There were several McKinney's showing up at this time from this area, making them a minor difficulty sorting out. Harvey ended up being a founder of the Blackfoot Rangers in the summer of 1862, which were made famous by being mentioned in Joseph A. Mudd's "With Porter in North Missouri." Despite the fact of their post-existence fame years later, the Blackfoot Rangers appear to have only existed a couple weeks and appear not to have had any name recognition during that actual brief period, with its personnel quickly showing up in other units, including the Purcell Scouts.