I've used them a lot. Place them outside city limits, especially on useless spots (say, tundra not near a river, or desert). Place units in them. Watch as incoming barbarians charge at the fort and die.
It works pretty well, and gives my forward pickets a safe place to retreat without having to go back to the city. When barbarians come in, the fort units can hit them before they can pillage.
It works pretty well, and gives my forward pickets a safe place to retreat without having to go back to the city. When barbarians come in, the fort units can hit them before they can pillage.
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