Setting the Advantage - what does it change?

[Aragorn]

I have tested it and increases the casualties inflicted by the side that has the advantage and increases the probability of an assault taking a bunker or pillbox.  In the Napoleonic series, if you slide all the way in one direction, you can have a skirmish unit wipe out whole regiments.

There may be other changes, but, those are the ones I have observed.

Interesting. Could you please give an example in which measure the casualties increase?

And are there perhaps others who know whether there are other effects of setting the advantage high for one side?