The Hellcannon is treated as a war machine with the exceptions below. The three crew form a unit with the Hellcannon. The unit has a 360° arc of sight. The Chaos Dwarfs act as war machine crew in combat, but will line up on either side of the Hellcannon instead of in front of it.

When moving normally, the unit uses the Chaos Dwarfs' Movement rate. When rampaging, the whole unit moves 2D6".