Fortified Camps surrender

[Baris]

After simulating the same battle 5 times I saw that Ferdinand forces surrender without a fight to French Force sieging in the region with fortified camp. Ferdinand didnt have artilery that can be the reason? Observation army sieged in the west has artilery and less supply than Ferdinand but at least he fight 3 battles.

Other thing is both fortified camps were not breached but Prussians took heavy losses from assault.(Ferdinand just surrendered! ) In the first 2 rounds of the battle Every unit were able to breach walls during assault(from a Total of 6 rounds). assaults are very much successfull, French should have taken more damage by assaulting without breach even they had big force.
by mistake I erased the battle log .

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Edit: Also fortified camp in Osnabruck disseapeared without a battle.