May or may not be an earlier version of the Dreadquake Mortar.
The Earthshaker Cannon is a massive weapon of destruction and one of the most deadly weapons in the arsenal of the Chaos Dwarfs. It fires a heavy shell full of powerful explosive. When the shell lands it smashes into the ground, burying itself deeply before it explodes, creating devastating shock waves. As well as blowing its target apart, the shockwaves of the explosion are so strong that nearby troops are knocked to the ground. Troops close to the blast will be far too shocked by the impact to fight, or even to move. All they can do is lie on the ground, dazed and confused, until they recover their senses.[1a]
Each Earthshaker Cannon has a crew of three Chaos Dwarfs to operate the weapon and defend it if necessary, who wear heavy armour and wield hand weapons.[1b]