This article is considered accurate for the current version (1.54) of the game.
The Chieftain assault tank is fitted with asymmetrical armaments, including a 250mm mortar cannon and a twin-barrelled 12.7mm turret.
— In-game description
The Silverhand Chieftain - Mk. VI (also known as the Chieftain) is a late-game WardenAssault Tank designed to destroy heavy fortifications. It is equipped with a 250mm Mortar Cannon and a dual-barreled 12.7mm machine guns turret.
The Silverhand Chieftain - Mk. VI has 3100 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: 15%, Turret/Cannon: 20%, Second Turret/Cannon: 30%. It has Tank Armor. With it, in best case scenario, penetrating projectiles only have a 27% 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 170 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.
The Silverhand Chieftain - Mk. VI is specifically designed to destroy enemy static defenses at close range, with concrete structures being the most susceptible to 250mm shells. Emplacements are also high-value targets, but all of this depends on how dangerous they are compared to other defensive structures in the area. 250mm shells excel at breaking concrete, so T3 bunkers are high-priority targets. Suicidally charging concrete bunkers, preferably with multiple Chieftains, can smash holes in enemy lines, though usually with the loss of all tanks involved. Due to its short-ranged weapon, small inventory space, and helplessness against armored enemies, the Chieftain requires support in order to get close to its targets and be used effectively.
Due to the small inventory space, more Chieftains may be required in order to fully take down an enemy concrete structure. This weakness can be mitigated somewhat by bringing along additional 250mm in trucks or on pallets.
The twin-barrelled, high-velocity 12.7mm machine guns housed in the turret make the Chieftain a top-of-the-line anti-infantry vehicle. It can also destroy unarmored vehicles and Tier 1 structures. The slow turn speed of the turret leaves it vulnerable to flankers, but any infantry caught by its guns will be mowed down quickly. The Chieftain can effectively support friendly tank lines against enemy infantry and structures. Its high health and armor allow it to survive a few hits as it retreats from enemy armor.
It is important to protect the Chieftain from enemy armored vehicles and flanking infantry with AT weaponry. Friendly infantry can support it by watching its flanks and flushing out enemy AT infantry hiding in trenches or structures.