Mongoose

Mongoose are widely considered to be dangerous lunatics, and openly flaunt their violations of the Rules of War. They make extensive use of flamethrowers and rocketry, and are funded by the Rail Barons.

They would likely have been destroyed by their growing list of enemies long ago if not for their legitimate military strength and love of scorched-earth warfare, and policy of waging brutal and disproportionate retribution for any offence.