Depending on the year you're fighting, you could use a combo of armored cars and heavy artillery to get a ton of soft attack breakthrough and piercing, with some infantry in there to keep the organization up. My recommended template would be as follows:

Armored Cars: 3
Heavy Artillery: 2
Infantry: 4
Recon Company, Engineer Company, Support Artillery

This template is designed to allow you to get multiple of them into a battle at once, so I would recommend using multiple of them for the best results, especially in France. If you would like a more powerful single division instead, use this makeup instead:

Armored Cars: 5
Heavy Artillery: 6
Infantry: 6
Recon Company, Engineer Company, Support Artillery

In order to keep momentum up, I would also recommend using some purely armored car divisions to drive through the gap made by these heavy divisions, as the armored cars will allow you to speed through a lot of resistance. This would mean even the support companies would have to be faster as well, so keep that in mind. Hope this helps!