Interesting discussion. I myself am not fond of the Cover promotion, and only slightly less reluctant to hand out Shock promotions. I give the latter to a handful of units to defend against melee unit counter-attacks. You're unlikely to get attacked by archery units (though it does sometimes happen, the AI being what it is). So the only real reason to grab Cover promotions is for offense. And I think there are better choices. The reason is the long term. I plan to have my best City Raiders with me for a very long time, graduating from Axes/Swords to Maces, Rifles, Infantry, and perhaps even Mech Infantry if the game goes that long. Right around the time they graduate from swinging metal balls at people to taking pot-shots at them, the Cover promotion starts to become useless. Worse, it makes later, more universally useful promotions more expensive. Thus, I'd rather stick to City Raider promotions and once I've collected the full set, Combat. I may throw in a Pinch promotion in the gunpowder era.