I don't know how many people have noticed this, but I recently engaged in an early war with the Aztecs. They sent about 6 jaguar warriors into my territory. I did not have horses, so I was forced to attack them with slow units. On several occasions, I would attack a fortified unit with 2 health, and it would retreat. My unit would obviously end up right next to it, and I would figure it would either have to run away or I would kill it next turn since it had only one hit point. When it got to be my next turn, the damn thing had healed again, even though it essentially moved when it retreated. Talk about a pain in the ass. I would then have to repeat this 3 or 4 times until I trapped it against the coast. I realize units are supposed to heal when they are fortified for a turn, but if it loses an battle and retreats, I hardly think it had time to nurse its wounds. Oh well, just ranting to relieve the frustration.
