Juggernaut: SiegeBreaker

Drive a lone steam tank at the head of an army of thousands. Halt, shell the towers that slaughter your troops, then send waves of fusiliers, sappers and shieldwalls to suppress the armoured towers and storm the castle. Neither tank nor troops can win alone.

PC controls:

Hold W / S (or Up / Down): drive forward / reverse. Let go to halt
Left-click and drag the view: aim the cannon
Space (or Enter, or click the FIRE lever): fire
A / D, R / F: aim with the keyboard
1 / 2 / 3: pick troop type (or click the medallions)
E: blow the whistle to send a wave
Esc / P: pause 

Mobile controls

Left lever: push up to advance, pull down to reverse, middle notch to halt
Right stick: aim the turret and barrel
Fire lever (centre): pull down or tap to fire
Medallions: pick troop type. Whistle: send a wave 

The cannon only fires while the tank is halted.