were you using regular hoplites without any mods. if right i know the mistake.
regular hoplites are not that reliable. their morale is four. when a general charges in their morale drops but your general was present too so that didn't matter. because they charged your unit started to waver and taking losses and eventually started to rout. it's not the three deep formation but the unit that cracked and the formation you used are only for good troops that can hold crucial places in the battle line.
and in bridge battles
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