Hmmm. We don't have it. I checked every site that came up in the Google search, and all had the same four lines, all unattributed except for this page (click), which says it comes from Collier's Weekly, Sept 1,1928.

Now, I did find out that Tom Glazer recorded "Bennington Rifles" on an LP titled Namu, the Killer Whale, and Other Ballads of Adventure. Does that ring a bell?
Happy hunting.
-Joe Offer-