[Homer_J_Simpson]

“Battalion of the Rocky Mountain Club”

Never heard of them. What did the Club do during the war?

Split, half to the Union, half to the Confederacy?

Maybe a tanker from the Rocky Mountain State knows about them.

[colorado tanker]

I have never heard of a Rocky Mountain Club back in this time in Colorado history. Of course, in 1860 what we know as Colorado was mostly in the far west of Kansas Territory. In 1860 folks coming to these parts were too busy digging for gold to spend time on social clubs and parades.

Given the context, it appears to be a New York based social club. It might have been a predecessor to this that I found in Wiki:

The Rocky Mountain Club was incorporated in New York City as an "Eastern Home of Western Men" with the purpose to "create good-fellowship among the members and advance the interests of the Rock Mountain States." John Hays Hammond was the only President. The original directors were: W. B. Thompson, A. J. Seligman, John Campbell Cory, B. B. Taylor, Frederick Russell Burnham and J. J. McEvelly. Theodore Roosevelt was a prominent member, along with U.S. Senator Thomas Kearns of Utah and U.S. Senator W.A. Clark of Montana.