| cannon towers are great for guarding expos because by then you have a workshop (unless you are secksi like Ed and go fast expo) and you dont have many building to "friendly fire". another advantage is that it is siege damage meaning that it blows up unarmored units and light armored (gg hunts and casters) and i think they have the best amount of damage out of the three to normal units.
you might be concerned about the friendly fire drawback but even if you pound away at your base with it, the splash damage is little to insignificant to be much of a problem (10-15 damage tops) plus i think that they do less damage to allied units.
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Lost causes are the only causes worth fighting for. |