Sometimes we need to detach one or two regiments for a Grand-tactical important mission, such as rushing for a lop, defending an important passage, bridge, etc. Right now I can only do this by ordering the units to "March" (march column formation!!), but I have heard that this can lead to the unit being immediately routed in case of a sudden attack. If this is the case, I think that there should be additional "deploy" and "defend" orders for regiments as well.