Double Cannon

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"Double cannons, double shots per cannon, It's a double-double dose of trouble!"

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Level 1

Level 2

Level 3

Level 4

Level 5

Level 6

Level 7

Level 8

Level 9

Level 10

Summary

• The Double Cannon is a defensive building in the Builder Base that fires rapid bursts of cannonballs at ground troops, with four shots per volley. It is unlocked at Builder Hall level 2.
• The Master Builder can gear up a Cannon in the Home Village which will allow the Cannon to shoot similarly to the Double Cannon. This requires the Cannon to be at least level 7 in the Home Village, which is unlocked at Town Hall 6, and a level 4 Double Cannon in the Builder Base, which is unlocked at Builder Hall 4.
• While Double Cannons do high damage per second, they have a shorter range and cannot attack air troops.

Strategies

Defensive Strategy

• Double Cannons are specialised to doing high ground DPS, enabling it to be an effective defense against ground tanks such as the Boxer Giant or the Battle Machine. It is also capable of picking off low-health troops in a few volleys, such as Bombers, Cannon Carts, Night Witches and Electrofire Wizards.
• Although it has high damage output, the Double Cannon has a weakness against large swarms, as their burst only targets one unit. You will find it useful to protect Double Cannons with splash-damaging defenses like the Multi Mortar or the Roaster. Its inability to attack air also means that you should also protect Double Cannons with air-targeting defenses like Archer Towers.
• Their short range prevents them from protecting buildings in front of them from Sneaky Archers if a Wall separates the Double Cannon and the building. It may still be useful to leave a building in front of them to prevent Sneaky Archers from easily destroying them under their cloak.
• A larger issue arising from its short range comes in its interaction against the Cannon Cart, as the latter can outrange the Double Cannon by going into Mortar mode. To prevent Cannon Cart value, defenders should avoid grouping short-range defenses together.
  • An alternative to defending against Cannon Carts is to bait attackers into using them by deliberately grouping short-range defenses together, but also rig likely deployment locations with Push Traps to push them in range. However, skilled attackers will often use small units like a single Sneaky Archer to test for these traps beforehand, enabling their Cannon Carts to exploit the weakness.

Offensive Strategy

• Air troops such as the Baby Dragon have little to worry from a Double Cannon since the Double Cannon cannot attack them. However, the Double Cannon can still distract them and prevent them from attacking more important buildings.
• The Double Cannon is weak against large swarms. This makes them easy to overwhelm with Raged Barbarians or Skeletons from the Drop Ship.
• Its short range allows the Cannon Cart to outrange it while the Cart is in Mortar mode. However, if the Cannon Cart is not properly watched by the attacker, it may wander into range while in Cannon mode and be promptly destroyed.

Upgrade Differences

The Double Cannon undergoes significant visual changes at levels 4, 5, 8, 9, and 10.

• When initially constructed, two cannons are tied together with rope at the neck, with riveted wooden plating on the side of the barrel, on top of rotational rotational mount in the ground. The mount is surrounded by wooden planks acting as a foundation, with a piece of plank bolted down at the front corner and some vegetation around.
  • At level 2, the cannons are bigger, the rope holding them together is now strapped between them, there are now two wooden plates side by side and they become vertical. The inner planks has studs in the middle, the outer planks are flush at the corner and studded there, and the bolted piece is removed.
  • At level 3, the cannons are even bigger and instead of two separate cannon barrels tied together, the two barrels are joined together as one piece, the ropes in between are removed, and the two wooden plates are merged into one and become copper. The inner and outer planks surrounding the mount merges and is raised up from the ground and most of the vegetation on it disappear.
  • At level 4, the ropes are replaced with a copper band around the neck, and the copper plates on the sides are removed. The planks connect diagonally, the corners of the foundation receive metal plates with brass rivets, and all of the vegetation is removed.
  • At level 5, the cannons become substantially larger and another copper band appears near the back of the barrels. The side of the base is reinforced by copper plates and the corner plates are part of the foundation and thicker.
  • At level 6, the front copper band turns golden and the muzzle rings become copper. The corner metal foundations are changed to square wooden foundations with golden square embeds on them.
  • At level 7, the rear copper band also turns golden. The copper plates on the sides are replaced with golden plates and the corner wooden foundation turns into a brownish stone.
  • At level 8, the side of the barrel gains a golden fitting with a golden ring, the back band extends into a trapezoid in the middle, and the back of the barrels turn gold. The corners foundations turns into gold from brownish stone and the gold squares are replaced with copper fitting holding a gold ring.
  • At level 9, all the fittings and gold rings are removed. The back band moves further back and is wider, and some thick gold plates are welded on top, the trapezoidal bump also becomes a plate. The gold plates on the sides are replaced with black metal plates which indents through the middle and the corner foundation is L-shaped, raises even higher, and slanted on the top.
  • At level 10, both cannons are almost covered in gold and the muzzle ring is now silvery, the side plates are replaced with a folded triangle.

Statistics

Gold Pass modifiers

Input Gold Pass boost to modify the statistics in the tables below accordingly

ApplyReset

Number Available	Builder Hall Level
	1	2	3	4	5	6	7	8	9	10
Total	0	1	1	1	2	2	2	3	3	3

Size
3x3

Level	Damage per Second*	Damage per Shot	Hitpoints	Build Cost	Build Time	Experience Gained	Builder Hall Level Required
1	84	50	600	20,000	10m	24	2
2	92	55	690	50,000	1h	60	3
3	103	61	800	80,000	3h	103	3
4	113	67	910	300,000	12h	207	4
5	125	74	1,050	900,000	1d	293	5
6	136	81	1,250	1,400,000	2d	415	6
7	150	89	1,450	2,200,000	4d	587	7
8	165	98	1,700	3,200,000	6d	720	8
9	182	108	1,950	4,200,000	8d	831	9
10	202	120	2,200	5,200,000	10d	929	10

Range	Time Between Bursts	Shots Per Burst	Damage Type	Targets
7 tiles	1.6s	4 shots	Single Target	Ground

*These damage per second values are seen in-game and are approximations; it does not necessarily do this much DPS if it cannot utilise the full potential of its bursts.

Icon Descriptions

	Tapping this icon displays information about the Double Cannon, such as Level, Damage Per Second, Hitpoints, Range, Damage Type and Targets.
	Tapping this icon begins upgrading the Double Cannon to the next level, if you have enough resources and a free Master Builder or O.T.T.O. When the Double Cannon is at maximum level, this icon is not shown.
	Tapping this icon instantly upgrades the Double Cannon to the next level, at the cost of one Hammer of Building if you have one. When the Double Cannon is at maximum level, or the Builder Hall requirements for the next level are not met, this icon is not shown.
	Tapping this icon, which is displayed only while an upgrade is in progress, instantly finishes that upgrade at the cost of the displayed number of Gems.
	Tapping this icon, which is displayed only while an upgrade is in progress, instantly finishes that upgrade at the cost of one Book of Building. This icon is only shown if you have at least one Book of Building.
	Tapping this icon, which is displayed only while an upgrade is in progress, instantly finishes that upgrade at the cost of one Book of Everything. This icon is only shown if you have at least one Book of Everything but do not have a Book of Building.
	Tapping this icon, which is displayed only while an upgrade is in progress, cancels the current upgrade and refunds half of the upgrade cost.

History

Patch	Type	Description
May 22, 2017	Update	Added the Double Cannon with 5 levels.
June 27, 2017	Update	Added the level 6 Double Cannon.
September 27, 2017	Update	Added the level 7 Double Cannon.
March 5, 2018	Update	Added the level 8 Double Cannon.
June 18, 2019	Update	Added the level 9 Double Cannon.
May 15, 2023	Update	Added the level 10 Double Cannon.

Trivia

• Although the Double Cannon shoots burst fire of 4 shots, the Double Cannon will not separate the shots on different troops. For example, if it targets a Sneaky Archer with low health, the 1st shot will kill it and the remaining 3 will be wasted.
• Although the description implies that the two cannon barrels fire two shots each per volley, all four shots appear to come out of the middle of both these cannon barrels. This trait is shared with the Multi Mortar, whose shells are all fired from a single barrel as opposed to all of their barrels.