When attacking Boom Cannons, be sure to either destroy them upfront with a Barrage or Artillery, or limit your time in range of them without them being shocked.The Boom Cannon is one of the strongest defenses in the game and is very effective against high health Troops, such as Tanks or Heavies.The Boom Cannon is a long-range, single shot defense that deals very high damage per shot, but with a slow rate of fire.The Boom Cannon is the sixth defense to be unlocked in the game.