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Role: Defensive Structure
The Photon Cannon is the Protoss defensive structure effective at defending from ground attacks as well as air. Thus building a wall of cannons will require a large force to break through it. Since they do well at taking down small attacks, placing them all around the base is a good idea. Photon Cannons are also Detector units and can expose hidden and hallucinated enemies.
Sometimes, the cannons can be used on the offensive just as well. This tactic is generally done on an enemy base they wish to take over or early in the game. Photon Cannons are continously built in front of one another until the enemy base is wiped out. Although this strategy only works if the enemy never notices the cannons being warped in until they start to attack.
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