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'''Rotor Cannons''' were weapons used by the [[Imperial Army]] and [[Space Marine Legion]]s during the [[Great Crusade]] and [[Horus Heresy]]. These weapons were multi-barreled [[Stubber]]s, using electric motors to maintain an extremely high rate of fire from their spinning barrel. Their medium caliber-slugs lacked the power of [[Bolter]] shells, but nonetheless the sheer volume of them proved effective against unarmored hordes of foes and fleshy [[Xenos]]. Eventually, the more famous Space Marine [[Assault Cannon]] was developed from the Rotor Cannon.{{Fn|1}}