Concerning return fire: I found it most useful to deploy 2-4 archer squads in loose formation in front of the artillery to function as arrow sponges. The towers almost always target the closest units, the exception being if your general is within their range (here seems to be a hidden target priority list somewhere). This way you'll only loose quite a few cheap archers. Remember to advance them with your assault troops until you reach the breaches. Saves some casualties among the heavy inf.
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