Imperial Ordnance Pieces
Aside from the well-known and beloved Basilisk, the Imperial Guard fields three other common types of field artillery. Like the Basilisk, these guns are mounted on a stripped Chimera chassis. This makes the ordnance pieces rather vulnerable in direct combat but due to their nature they should see little direct combat as their main purpose is to moonscape the enemy's position.
Griffon
The lightest ordnance piece the Imperial Guard fields, the Griffon Heavy Mortar Carrier does exactly that: it carries a heavy mortar capable of destroying entire squads of medium infantry in a single shell. Because of the modest size of the weapon it fields, the Griffon can afford an on-board targeting system so that it relies less on allied intelligence via vox channels. Combined with the light payload the weapon fires, this makes the Griffon's bombardments more accurate than that of any other ordnance piece the Guard can field.
Medusa
The Medusa Siege Cannon is less about lobbing large shells into the ranks of the enemy and more about directly putting holes in enemy fortifications and tanks. The Medusa does this well; although it's not as long-ranged as other pieces of ordnance its large shells can turn anything from bastions to groups of enemy infantry to dust in a single shot.
Colossus
The Colossus Bombard is the big daddy of the field artillery. Firing shells the size of a man, anything struck by its colossal Siege Mortar will disappear, cover or not. It is in fact so big it requires a special loading arm attached to the chassis of the transport to load shells into the weapon.
Gallery
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The Griffon Heavy Mortar, here shown with added mine plough.
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The Medusa, regular pattern.
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The Medusa, AWESOME pattern.
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The Colossus, here seen with it's loading arm.