The Archer Tower is the first of the Defense Buildings you unlock in Samurai Siege. It is a high-powered, one-target defense that excels at taking out single, stronger units. It has trouble with masses of infantry, as it can only take out one at a time. The Archer Tower has a relatively far ranged distance and can attack ground and air troops alike. You will not be able to build an Archer Tower until you have unlocked it. This is done by completing the mission Focus, Focus, Focus! in the single-player Campaign.
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