I think you misunderstand me. You are a french native speaker yes? I am guessing from your grammar.
I spectacular failure of morale does not have to be caused by losses. The surprise of the village being occupied might qualify to be a rout, it certainly was in real life. What I AM saying is, an organised retreat should be a choice the Regimental and Tactical AI can make, as a reaction to pressure, WITHOUT the unit routing. As it stands this never happens at a regimental level.
For example, if a regiment is attacked by 2 enemy regiments, the colonel will issue a retreat order. The regiment will slowly march backwards towards support, fighting a rearguard action along the way. They might have only taken light losses, but the colonel can see that they will lose and so choses to preserve his command.
Then a battery opens fire on the regiment, lowering their morale and causing them to rout. This is not something the colonel has chosen to do, it is something that has happened spontaneously among the men.
Can you see the difference here?
I believe what people are saying is that in game units rout inappropriately, from too few losses. I was suggesting that the units could be made "braver" and be balanced out by retreat orders by the AI.
I wonder, is the morale system based largely on losses? I think there needs to be a certain "shock" element to morale, where a regiment can stand to be bled slowly, say in a firefight, but factors like surprise, routing allies, being vastly outnumbered, and taking a large number of losses in a small period, say from concentrated artillery fire, can cause them to rout without taking many losses at all.
Apologies that my thoughts do not seem very coherent right now, I am on some strong painkillers and they have just kicked in.