I've read of people discussing weapons upgrades, and I've noticed where they could be bought in custom battles, but I haven't discovered the way to get them in campaign mode. I tried building the necessary building above (for instance, building spearmen in a province with a spearman's workshop), but I didn't notice the little icon in the bottom left of the unit's picture, so I'm thinking that isn't it. How do you upgrade your troops' weapons?
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