Building up unit experience

[Kralizec]

Originally Posted by Severous
Wonder if theres a gain for just turning up in battle?..and if thats the bit thats bugged/different between small and big scales? Do small scale units often gain experience without fighting?

I've seen units increas in experience once I clicked the "start battle" button. I think it happens when in the previous battle, some highly experienced men are "killed" but heal after the battle.