Another problem with simultating desertion with the RTW engine is that the movement speeds are relative low, so you might lose half your army to desertion when trying to get to the other side of Gaul! Also, there is no way to measure what the morale of the army is in the field, so an army might be winning battle after battle and sustaining few casualties, while another army is heavily outnumbered and far away from the nearest friendly base, and both armies would suffer the same levels of desertion.
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