Devitt-Caine Mk. IV MMR

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This article is considered accurate for the current version (1.54) of the game.

A modified Devitt fitted with a specialized Caine mortar turret at the expense of top speed.
In-game description

The Devitt-Caine Mk. IV MMR (also known as a Mortar Light Tank or MLT) is a Warden Light Tank equipped with a Mortar Tube.

General Info


The Devitt-Caine Mk. IV MMR houses a crew of three soldiers:

  • Driver (Seat 1)
    • Controls the movement of the vehicle, and can see the remaining fuel in the tank
  • Gunner (Seat 2)
    • The gunner aims, fires, and reload the mortar. The only crew member who can see the ammo type loaded.
    • Use Mouse Scroll Wheel to adjust the range
    • Switch ammo types by pressing F
  • Commander (Seat 3)
    • The commander is able to view the battlefield with Binoculars, telling the gunner where enemy structures or vehicles are to shoot at, while also reporting on where the shells land to ensure they hit their target. They have no hatch to hide.

The turret is open top making the commander and gunner exposed to small arms fire and shrapnel.


  • Mortar
    • Mounted on a rotating platform inside the open-top turret (can rotate 360 degrees, turns 10° per second)
    • Ammo Used: Mortar Shell, Shrapnel Mortar Shell, Flare Mortar Shell
    • Reload Duration: 3.5 seconds per projectile
    • Range: 45-80 meters
    • Fire Rate: 12 per minute
    • Accuracy: 2.5m radius at minimum range up to 9.45m at max range (not including Wind effect)


It has three dedicated ammo slots that can hold 15 Mortar Shell, 10 Mortar Shrapnel Shells, and 10 Mortar Flare Shells.

Health & Armor

The Devitt-Caine Mk. IV MMR has 1950 HP and is disabled under 30% health. It has "Heavy Armor" resistance: it can soak small arms fire, shrapnel, and 12.7mm machine guns, and it is immune to Flamethrowers. But heavy explosives and anti-tank weaponry are a real threat to it.
It has subsystems that have a chance to be disabled by heavy explosives and anti-tank weaponry if hit specifically: Tracks: 30% (Anti-Tank Mines always disable them), Fuel Tank: 25%, Turret/Cannon: 20%.
It has Tank Armor. With it, in best case scenario, penetrating projectiles only have a 30% chance of penetrating and doing damage. That chance goes up quickly if the armor is worn or if it is shot from up close, or on the side or rear from a direct angle, or with ammo that has penetration bonuses.
It takes 135 Basic Materials to fully repair it from 1% to 100% health with a Hammer. Its health, subsystems, and Tank Armor can be instantly repaired at a Garage for 100 Basic Materials.


Structure Input(s) Output Time
Small Assembly Station (Tank Factory) 3 x Processed Construction Materials ProcessedConstructionMaterialsIcon.png
20 x  Assembly Materials I AssemblyMaterials1Icon.png
3 x  Assembly Materials IV AssemblyMaterials4Icon.png
2 MW of power ProductionPowerIcon.png
1 x   Devitt Mk. III Devitt Mark III Vehicle Icon.png
 Devitt-Caine Mk. IV MMR Devitte-Caine Mk-IV MMR Icon.png 00:05:00

The Devitt Mk. III must be fully researched in the Vehicle IconFilterVehicle.png Tech Tree in order to be produced.

Storage & Transport

The Devitt-Caine Mk. IV MMR can be stored in a Storage Depot, Seaport or Storage Ship.

It can be packaged into a small Shippable and transported by any Shipping Vehicle (Crane, Flatbed Truck, Barge, Freighter, Storage Ship, Landing Ships, Flatbed Car, or Large Crane).


Due to its armament, the Devitt-Caine Mk. IV MMR can be used either as a short-range artillery piece, or an infantry support role. The vehicle has the ammo capacity allowing it to provide enough firepower to damage small defensive structures, as well as having enough ammo for anti-infantry tactics, such as attacking them directly, or illuminating their position.

If the crew ever comes into a dangerous situation (either from artillery retaliation, or being flanked by enemy infantry), the crew should rely on the vehicle's mobility to escape. This is especially true if they are equipped with AT weaponry, where the damage to them will either slow it down, disable it, or outright kill it.

Although it is possible to use a Light Tank without a Commander, it's not recommended as it will limit your awareness on the battlefield.

Due to being classified as an artillery piece, the rounds are affected by wind and dispersion, so either the Gunner or Spotter needs to pay attention to where their shots are landing (preferably with binoculars) in order to make sure their shots are hitting their targets.

Mortar Strategy
Mortar weaponry, while good, has low High Explosive damage, meaning that a single mortar tube is typically not enough to destroy larger defensive structures, such as bunker pieces. Additionally, due to it able to fire HE rounds, it will get retaliated by bunker pieces with Howitzer Garrisons connected to it. Due it placement in the tech tree, it is more likely the mortar crew will face up against these types of targets.

As such crews will need to choose their targets wisely, or face near-certain destruction. If they are unable to, then an infantry support role is highly recommended.

Standard Equipment Loadout
Like with every other armored vehicle, the crew should ALWAYS equip themselves with a Gas Mask and multiple Filters to avoid dying to Gas Grenades. Additionally, they should bring a Hammer and Basic Materials to repair the tank. These tactics can be buffed by wearing either a Tank Uniform or an Engineer Uniform.

Despite being used in a support role (i.e. behind the actual frontline), crews should still equip themselves in case they are out-flanked. For the Gunner, it is possible for them to forgo the Basic Materials in order to hold more mortar shells.


  • The Devitt chassis is likely based on the French Cavalry tank the SOMUA S35 or its predecessor the Char D2