The AV-7 Anti-Vehicle Cannon, also called Republic Artillery Gun or Clone Artillery Cannon, was a repulsorlift self-propelled artillery unit used by the Galactic Republic during the Clone Wars.
The vehicle could be operated by one clone trooper in a seat on the side of the gun, and had a chamber for refilling shells to the side of the lower chassis.
The vehicle would float until it reached a suitable firing position and then entrench itself on the ground, using four metallic feet for support.
Republic Artillery Guns were used during the Battle of Christophsis where they countered the Confederacy's AATs and titanic Tri-droids. The Separatists erected an energy field which prevented the clone troopers from using the cannons, but Anakin Skywalker and Ahsoka Tano disabled it, allowing the cannons to help swing the outcome of the battle.