What about Antwerpen in F 14?

[Volcano Man]

Sure, give it a go, but I think you would need more than those two corps because the Belgians can be quite resilient, exhausted or not. I believe the Germans would need to divert siege guns to Antwerp to do anything meaningful though; you can squeeze through in some places but the siege guns will be needed to eliminated the fortress thorns that you bypass. Those siege guns are needed to reduce Maubeuge so, well, it is a tough decision either way as you will have to give up something I think.

Try out the Antwerp scenarios if you haven't yet, they are good tough fights for both sides.