For example, Barrage: +15% strength when attacking enemies in rough terrain like forest and hills.
The question is, does it mean: 1) I'm initiating an attack when standing on a rough terrain or 2) The enemy is standing on a rough terrain when I'm attacking it?
Google-fu doesn't bring up any result other than a comprehensive list of possible promotions, which for some reason lack explanations like the one I'm looking for
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