AI Civ having another civ's specialty unit
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How is it possible for an AI civilization to gain/build another civilization's specialty unit?
Twice now I have run into this issue. On my current game, the Dutch have a Cho-Ko-Nu (the chinese specialty unit). In a prior game, the Swiss had Legion units (the Roman spec. unit).
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In Gods and Kings, Militaristic City-States can sometimes grant the Unique Units of civilizations that are not in the current game as their unit gifts. Each Militaristic City-State grants a different UU, which can be found from that City-State's interaction screen.
Likely, the AI Civ in question made friends/allies with a nearby Militaristic CS, which is now granting them Cho-Ko-Nu.