I think the Zulu Impi are actually the best counter for them from a defensive perspective. Fortified Impi have better defense on any terrain than the offense of the Gallic Swordsmen. The Impi's extra movement means the Celts won't be able to retreat either. So the Zulu's should be able to at least hold their cities (and any important terrain), as the Impi cost 2/5 the shields, and the battles should be at least slightly in favor of the Impi. The expansionist/militaristic trait combination looks like the best in early warfare games as well. Expansionist/industrious would beat it, but the American UU comes a bit late...
Hoplites are nice, but the Gallic Swordsmen will be able to retreat when they are losing against them, probably a bit more than half of the time as the Greeks aren't militaristic, and so their units will be on average less well trained. Hoplites aren't as capable of responding to an invasion as the Impi either, you would expect 2x the number of Impi to be able to be at a critical location, or half as many overall needed to cover the same area, freeing up the other half to go pillaging.
Hoplites are nice, but the Gallic Swordsmen will be able to retreat when they are losing against them, probably a bit more than half of the time as the Greeks aren't militaristic, and so their units will be on average less well trained. Hoplites aren't as capable of responding to an invasion as the Impi either, you would expect 2x the number of Impi to be able to be at a critical location, or half as many overall needed to cover the same area, freeing up the other half to go pillaging.
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