In Barbarian Invasion you could fight night battles, but only if you were forced into it by the enemy, or your general had the nightfighting trait. One balancing point atleast for the Singleplayer campaign would be that the command could only be accessible if you have atleast one general who has the tactical retreat trait. It could also be linked to the general's command ability. If a unit tried this tactical retreat under a low command general they might get morale penalties which could turn the maneuver into a full fledged rout. Under a high command general though, your troops could get a morale boost.
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