Scourge of War Boards

I've created an OOB that is from a mod to use in the campaign that has multiple corps on each side but the campaign only ever picks two of them per side, at random. I can see that the stock game has a Full French Campaign that uses several corps. What is the secret to getting the SB campaign to work with more than two corps vs two corps?

Thanks

Fixed the problem. Each side needs a "side" commander senior to army commander.