It’s a plow with a cannon inside.
Why bother beating your sword into a plowshare when you can have it both ways? Normally the part of the plow that’s attached to the horse is a solid piece of metal, but on this plow, it was hollowed out to serve as a cannon. As “a means of defense in repelling surprises and skirmishing attacks on those engaged in peaceful avocation, it is unrivaled,” New York inventors C.M. French and W.H. Fancher wrote in their 1862 patent application.