"Shotgun Joe" - Rebirth Brass Band

"Shotgun Joe" (PDF) from the Rebirth Brass Band album, Do Whatcha Wanna

Who is "Shotgun Joe?"  And where is he going with that gun in his hand?  What gun?  Why do they call him "Shotgun Joe?"  I do not want to speculate anything because from the little research that I did, this tune could refer to a few different people, or possibly a controversial incident.  Unless I read some definitive documentation, I am just going to have to wonder about the history of this tune.  UPDATE:  Here's some reading material from Home Of The Groove (scroll down to "The First Indian / Brass Showdown / Throwdown?").

Well, here's a YouTube video that shines a little light on the history of this tune:

Recommended Reading: Home Of The Groove blog by Dan Phillips.