Warhammer Estalia concept art: Estalian artillery

Cannons are dangerous yet unpredictable weapons whose manufacture is limited to a few groups of human and dwarven experts. Although far from having the same quality and power as their Imperial or Dwarven counterparts, Estalian cannons have proven time and time again to be an invaluable weapon when facing off against large monsters or bringing down the walls of a fortress during a siege.
The cannons vary in length and size, but they have to be small enough to be pulled on their carriages to and from the battlefields. Once deployed, they rarely move as that would involve snagging the draft ponies. It is vital that they are in the correct position to deal maximum damage to the enemy before the battle begins.
Bombardas are weapons designed to launch an explosive charge into the sky so that the weight of gravity causes it to fall on the target. Bombardas are often used in sieges, where armies are more static, and their high trajectory is perfect for firing projectiles over walls and damaging buildings and tightly packed infantry.
Bombarda shells are hollow iron spheres filled with gunpowder. The crew lights the fuse before placing the projectile in the stubby barrel of the gun. The shells of the bombarda, when fired and the fuse is the correct length and does not go out, burst through the enemy ranks with a deafening noise, launching large amounts of lacerating shrapnel over a very wide area, so that they can eliminate many enemy soldiers at once