I believe, the suicidal AI reinforcement behavior is most prominent if they come onto the field closer to the enemy than you (also, if you control the really miserly part of your army on the field, for example some militia garrison unit, that actually is not able to do anything to tilt the battle balance): in this case, the general is likely to "lead by example" disregarding the fact that his foot army is not able to catch up and follow the valuable "example"... It is even more troublesome if there are wall towers involved ;)
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