Hrukidron-Barag

A Hrukidron-Barag is a war machine devised by Master Engineer Snorri Morgrimson. Its name means Goat Thunder War Machine. In essence, it is a ballista pulled by at least three goats. It can hold up to four dwarfen engineers armed with handguns. 
First used in battle at The Battle of the Rivet, it may or may not have displayed great promise on the field.