Assuming that the allies can have lvl 10 forts surrounding all France, 100ish Raj divisions and competent UK and France (meaning they'll try to have enough piercing, watch their ports, watch paratroopers, try to have air superiority), how do you deal with it?
I try to grind the forts down in 1939 using the following:
MARM divisions consisting of 3x motorized, 4x medium tanks (usually 1941-43 by 1939), 2 SPG
Infantry consisting of 7 infantry, 2 artillery and 1 1941 heavy TD
800 CAS + air superiority + around 300 tactical bombers
But if they can put 50 divisions into the province you're grinding... It's usually not even worth trying and it becomes better to just build the siegfried line and go after Russia before it's too big.
I try to grind the forts down in 1939 using the following:
MARM divisions consisting of 3x motorized, 4x medium tanks (usually 1941-43 by 1939), 2 SPG
Infantry consisting of 7 infantry, 2 artillery and 1 1941 heavy TD
800 CAS + air superiority + around 300 tactical bombers
But if they can put 50 divisions into the province you're grinding... It's usually not even worth trying and it becomes better to just build the siegfried line and go after Russia before it's too big.