That is one of the huge things that I miss from Civ2, being able to actually give military units to the weaker Civ. That is far more realistic and practical than giving techs and resources. I would rather give a Civ tanks and arty when they are technologically still riding around on horses. This is exactly what happens in the real world. I know it is a game, but this would be an awesome, fun feature.
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What luck for the rulers that men do not think. Adolf Hitler (good thing for the liberals or who else would support them)