The Earthshaker Cannon is the standard heavy artillery piece used by the siege regiments of the Imperial Guard. Its shells are packed with powerful high-explosives that will destroy nearly anything within a sizable radius. Besides its field artillery companies, the backbone of any siege regiment of the Imperial Guard are its heavy artillery companies. The heavy artillery pieces used by these companies are the big guns, deployed well back from the front lines to provide a sustained bombardment of the enemy forces during a major set-piece engagement. Imperial heavy artillery includes the Imperial Guard's workhorse Earthshaker Cannon, and the aging Medusa heavy siege gun. Both types of heavy artillery fire sustained bombardments, box barrages to isolate a battlefield from enemy reinforcements, harassing fire during an enemy advance, counter-battery fire to suppress enemy artillery and destructive fire at selected enemy units, all spotted for by artillery officers who serve in the dangerous duty as forward observers on the front lines.
The Earthshaker is a 132mm calibre gun, capable of firing a 38 kilogram shell over 15 kilometres at a velocity of 814 miles per hour. So a shell fired to the weapon's maximum range would take 19 seconds to reach its point of impact. The cannon itself is extremely reliable and consistent. It uses its standard five powder charges, but this can be increased with the addition of charges six and seven. This will increase the range of the weapon at the risk of the extra wear and tear on the barrel of the gun itself. Firing higher charged shots produces considerable strain and erosion on the barrel and the firing chamber, so that the weapon's breach seal fails, dramatically decreasing the gun's range and muzzle velocity and increasing the risk of a misfire. Because of this, the use of higher charge shells must be authorised by high command and the firing is recorded on each gun. No gun may fire more than 20 overcharged rounds. The Earthshaker can also fire different types of shells as the situation requires, including smoke shells, incendiary shells, illumination shells and diamantine-tipped armour-penetrating shells. While the Earthshaker is not as strong as the Demolisher Cannon in terms of brute explosive force, its remains an invaluable weapon thanks to its range. The Earthshaker Cannon is too large to be towed by a Centaur field utility vehicle, and the larger Trojan towing vehicle is needed instead. The Trojan can also carry the gun's crew and some of its ammunition as needed.
Siege regiments of the Imperial Guard are supported not only by their own heavy artillery companies but also by the overall army's bombardment corps. These are concentrations of heavy artillery pieces like the Earthshaker and the Medusa that back up the attacking regiments and are used to maintain sustained bombardments before the launch of major offensives against an enemy's entrenched, fortified positions.
There are several different variants of the Earthshaker Cannon used by the Imperial Guard's siege regiments. These include the following:
- Phaeton Pattern Earthshaker Platform - This pattern of Earthshaker, which originated on the Forge World of Phaeton, is the most common variant of Earthshaker Cannon in use by the Imperial Guard. The Phaeton pattern uses four large, flat legs to keep the weapon stabilised during firing, and during transport four small motorised tracked devices are attached to the ends of the legs in order to help with the transport of the weapon over difficult terrain.
- Lucius Pattern Earthshaker Platform - The Lucius Pattern, manufactured on the Forge World of Lucius, replaces the large stabiliser legs of the Phaeton Pattern with large metal wheels that can be locked into place during firing. These large wheels remain attached to the cannon at all times, allowing the weapon to be quickly towed out of a dangerous situation. The Lucius Pattern also lacks the large gun shield of the Phaeton Pattern.
- Hellbreaker Pattern Earthshaker Platform - The Hellbreaker Pattern Earthshaker is actually a slightly larger variant of the cannon that originated from the Mechanicus Forges near the city of Broucheroc.
The Earthshaker Cannon can be mounted either on a Basilisk mobile artillery piece or can be part of a fixed emplacement. The Earthshaker can be deployed in a fortification or used as a fixed positional unit, and in both cases will only be deployed well behind the Imperial Guard's front lines.
Known Users of the Earthshaker Cannon
- 27th Konig Armoured Regiment
- 8th Valhallan Armoured Regiment - The 8th Valhallan Armoured Regiment made use of the Earthshaker Cannon during the Siege of Sallan's World
- 98th Cadian Armoured Regiment - The 98th Cadian Armoured Regiment made use of Earthshaker Cannons during the Luxor Uprising
- 132nd Balle Regiment - Th Earthshaker Cannon was a key weapon in the 132nd Balle Regiment's participation in the defence of Balle Alpha
- 217th Tallarn Regiment - Part of the Tallarn Garrison Forces fighting close to the Cursus Portal
- 89th Tallarn Regiment - The 89th Tallarn Regiment deployed Earthshaker Cannons during the Taros Campaign
- 17th Tallarn Regiment - The 17th Tallarn Regiment also used Earthshaker Cannons during the Taros Campaign
- Death Korps of Krieg - The multiple regiments of the Death Korps of Krieg deployed to Vraks prime made heavy use of the Earthshaker Cannon during the Siege of Vraks
- Vraksian Traitor Militia - With its access to the massive Departmento Munitorum storehouse on Vraks Prime, the Renegade Vraksian Traitor Militia turned the Earthshaker Cannon against the besieging Imperial forces.
- Iron Warriors Traitor Legion - The warbands of the Iron Warriors Chaos Space Marines use all types of siege weapons, including Earthshaker Cannons taken from the Imperial Army during the Horus Heresy and later recovered from the Imperial Guard.
The Trojan Logistical Support Tank is one of the main workhorse vehicles of the Imperial Guard. The Trojan is mainly used to transport supplies from the safety of the supply dump to the front lines. This support vehicle is built using the same chassis and engine as the Chimera armoured personnel carrier, but it trades in its troop space for a supply hold, and possesses an external crane to hoist the supplies out. The Trojan can also be used to transport even larger amounts of supplies than can fit in its own hold on trailers that it tows behind it. Since it is larger than the Centaur utility tank, the Centaur is used to tow smaller siege weapons and trailers. The Trojan is only lightly armed, as it is not meant to be used as a front line combat vehicle. The Trojan is easy to manufacture and is very efficient in its role, but it is unable to tow vehicles due to its rather weak crane system. As such, that task is better left to the Atlus Recovery Tank.
The Trojan's main purpose is the transportation of supplies and other materiel to the front line, and this can include ammunition, foodstuffs, clothing, water, infantry weapons, and just about anything that is needed, as long as it fits inside the vehicle's chassis. The Trojan has several types of trailers it tows behind it, including a munitions trailer, a fuel tanker, and a general supply trailer. The Trojan can also tow weapons platforms such as the Earthshaker Cannon, Medusa Siege Gun, Quad Launcher, and Heavy Mortar Cannon, which may be too large or the terrain to rough for a Centaur to tow into position. The Trojan can also carry the large shells those artillery pieces require, so that they may never stop firing for want of ammunition. Trojans can be used as command vehicles and communications vehicles if the need arises, and as minesweepers and bridge layers if there is no other alternative.
The Trojan is a lightly armed and armoured variant of the Imperial Chimera. The Trojan uses the same hull-mounted Heavy Bolter as the Chimera but removes all other weapons in favor of providing space for supplies. The Trojan can be outfitted with a Pintle-mounted Heavy Stubber or Storm Bolter and a Hunter-Killer Missile Launcher to give it some more firepower, camouflage netting, extra armour plating, rough terrain modifications, and track guards to give it more protection, and a searchlight, a dozer blade, improved communications equipment, and smoke launchers to make it more useful.
Known Regiments That Make Use of Trojans
- 61st Death Korps of Krieg Armoured Regiment - Fought during the Siege of Vraks resupplying Imperial forces alongside the Centaur utility tank.
- 28th Death Korps of Krieg Tank Regiment - Galen V Expedition Force
- 9th Dnieper Tank Corps
- 17th Tallarn Heavy Tank Company
- 9th Krieg Heavy Tank Company
- 12th Valhallan Field Artillery
- 8th Valhallan Armoured Regiment
- 597th Valhallan Regiment
- 9th Konig Heavy Tank Company - Colonia Campaign
Medusa Siege Gun
The Medusa is an Imperial heavy artillery siege gun used by the siege armies of the Imperial Guard to bombard heavily fortified enemy positions. Besides its field artillery companies, the backbone of any siege regiment of the Imperial Guard are its heavy artillery companies. The heavy artillery pieces used by these companies are the big guns, deployed well back from the front lines to provide a sustained bombardment of the enemy forces during a major set-piece engagement. Imperial heavy artillery includes the Imperial Guard's workhorse Earthshaker Cannon, and the aging Medusa heavy siege gun. Both types of heavy artillery fire sustained bombardments, box barrages to isolate a battlefield from enemy reinforcements, harassing fire during an enemy advance, counter-battery fire to suppress enemy artillery and destructive fire at selected enemy units, all spotted for by artillery officers who serve in the dangerous duty as forward observers on the front lines. Siege regiments of the Imperial Guard are supported not only by their own heavy artillery companies but also by the overall army's bombardment corps. These are concentrations of heavy artillery pieces like the Earthshaker and the Medusa that back up the attacking regiments and are used to maintain sustained bombardments before the launch of major offensives against an enemy's entrenched, fortified positions.
The Medusa siege gun fires a heavier shell than the Earthshaker Cannon at a lower velocity over a shorter distance. The heavy shell has excellent destructive capabilities, but the Medusa cannot match the Earthshaker for its longer range and so is less useful for harassing fire and counter-battery fire missions. Instead, it is primarily used to destroy enemy fortifications, such as bunkers, pillboxes, walls and trenches. The Medusa, like the Earthshaker, is too large to be towed by a Centaur field utility vehicle, and the larger Trojan towing vehicle is needed instead. The Trojan can also carry the gun's crew and some of its ammunition as needed. Like the Medusa Siege Tank, the stand-alone Medusa Siege Gun is capable of firing different types of ammunition.
- High Explosive - High Explosive Rounds are the standard shells used by most artillery weapons. These shells are more than capable of destroying infantry units and even vehicles through their sheer explosive force.
- Siege Shells - Siege Shells are used against enemy structures and fortifications. They are fused to explode after hitting the ground, causing damage to the building's foundation.
- Bastion Breacher Shells - These shells are fired by the Medusa tank and the stand-alone Medusa Siege Gun. They are fired directly into the enemy walls where they burrow deep and then explode after penetrating, causing the wall to explode outwards and creating a breach for Imperial infantry to enter through. [Source: wikia]
You can download the paper craft model here: Warhammer 40K - Earthshaker Cannon, Medusa and Trojan Paper Models [Box] [Gavitex] [Copy]