Press (1) to activate main gun. Press (2) to activate mounted machine gun. Press (3) to activate water propulsion. Press (4) to activate land propulsion and hatches. To control weapons, use pitch for elevation and roll for traverse. To control propulsion, use VTOL to control left side and Trim to control right side. To control hatches, use throttle. The primary self-propelled gun of the Pilotmario Army. Equipped with a 155mm coilgun, it is a feared and powerful machine. They are designed to operate with "shoot and scoot" tactics, relocating after firing a salvo in order to avoid counter-battery fire. The 155mm coilgun proved highly accurate and hard-hitting, although ammunition capacity in the machine was limited to 11 shots (1 in breach and 10 in reserve). They were always accompanied by Mk II Ammunition replenishers, which were turretless Ballista SPG and could carry an additional 20 rounds. Because they were built on the Avenger hull, they retained the Avenger tank's mobility. The only major changes to the hull is placing the engines to the front in order to put the turret to the rear in order to facilitate easier loading. While mainly designed for indirect fire, on occasion they were used in a direct fire role. In the as of now ongoing battle for Avalanche airport, a battery of Ballista were threatened to be overwhelmed by a company of infantry supported by Panther III of the Vardanian Army. The commander of the battery, Luis Mondragon, decided to engage the infantry with airburst HE and canister. The infantry suffered heavy losses, and the tanks, now without infantry support, retreated.