So, I will use a strategy: My strategy will be that when the Benelux army arrives, they are going to be particularly in Belgium and Netherlands, trying their best to protect poor, weak Luxembourg. My strategy is also quite about the 40k troops stationed in the border, the troops will be used to surround Belgium. I will use my superior army to crush their army before they can use conscripts, I will also invade Belgium first, and shockingly not attack Luxembourg yet. But then, once I have Luxembourg surrounded, I will use an operation called Operation ODA, which is mainly about surrounding Luxembourg and then taking all of it. Luxembourg will not stand a chance, and I will only use 50k of my army, since even today Luxembourg is highly unlikely to conscript more people than that. Once I have taken Luxembourg and Belgium, I will get my whole army to charge into the Netherlands. This should be the absolute hardest part that my army had, however if they do beat the Dutch, then I am pretty sure that we have the control over the Benelux.
Lime is the army that we plan to take, purple is already taken.