usually it was a single batallion running, not the entire regiment (but batallions are not depicted in LG, apart from a graphical point of view).
Is this a part of the problem, a Battalion gets into serious problems, which makes the whole Regiment rout.
hummmmm... just a short remark...
There are some difference:
a) flanker : a regiment with 3 battalions can protect one flank... and the 2 ones with 4 battalions en more...
b) defensive line : the length of the front line increase with the number of battalions...
The rate of casualties is calculated from the strength regiment, not only the strength engaged.
So, the number of battalion modifies the results... BTW, it's really important for the hand to hand fighting.
JMM
In HLG, however, there is lots of routing before the infantry gets anywhere near musket range.
We have to check these behaviours again to be sure...
Beta Test Team made a lot of tests for this kind of combat to validate the model...
That said, tests were one unit vs one, two, three ENI ones. The idea was to be sure for simple fighting...
I have to check this combat again, before modifying the parameters if need.