OK, I think I've found it. It's Citizen Soldiers.
Citizen Soldiers wrote:
Use when you draft a French card. You may immediately prepare that card.
Indeed, it does not specify the type of card that is drafted. Now, normally, you can only draft Build cards; however, there is another French status card called Barès Expands Armée de l'Air, which allows you to draft Land Battles.
I'd say the combo works. If you've got both Barès and Citizen Soldiers on the table, then I believe you can draft a Land Battle and immediately prepare it.