it sounds like most people here are talking about how to win in iron cross or aod. darkest hour is completely different when it comes to france.
to do this you will need:
- at least 90 infantry divisions
- at least 12 tank divisions
- at least 3 hqs
- at least 10 motorised divisions
- at least 4 Calvary divisions
In reality the germans had 141 divisions and the allies had 144.
for air you will need
- 16 CAS
- 8 fighters
- 12 inter
- 8 tactical
- 4 stragic
I suggest you place your fast units near Luxenbourg and southern Belgium, this is where you will break through them, you will place most of your troops here.
before you invade, use your strategic bombers for logistical strike on the maginot line, this will lower infrastructure there thus reducing the enemy speed to relocate.
use your bombers to destroy airports, the idea is to not allow enemy aircrafts to reorganise as fast as they want to.
begin the invasion with as many troops on assault as possible (if you have the resources)
breakthrough belgium and luxemburg, there should be no resistance at first. then you will see the enmy once you move into belgium and luxemburg. carefully attack in the best way, using attack and support attack from different provinces. this is where your fighters/inter come in and your CAS, use your CAS for ground support. this is very very important. without ground support you will move very slow and eventually just sit there. ground support will take chunks off the enemy organisation. with low infastructure you will see the french struggling to move back.
DO NOT TRY and encircle the French in the Netherlands or Belgium, this will slow you down by at least a month or two, in fact it could ruin your advance. you want to keep your lines clean without encirclement until you destroy Belgium and the Netherlands.
you see when you break through Luxembourg and belgium you should head towards bruges. thus cutting them off from any support. do not use those troops to go back and support the Netherlands, instead now you find holes or weak points to move towards paris. while having small armies take care of the rest of belgium and the netherlands. DONT LEAVE BEACHES UNPROTECTED!
best way is to support attack on lille from all direction this taking the airport, now your only a few provinces away from paris.
take paris, then do a swing on the maginot line, those troops from belgium and the netherlands should have finished by now and joined your main lines, move towards the maginot and the event will pop up.