I have recently ran into an issue where parties joining my army have an insane amount of food. Its enough to overburden the entire army. There is no way to trade it away from them, or tell which party is the issue once they have joined the army. It's making army usage almost impossible. I have resorted to just running around the map during a war with my own party. Seems like a huge issue that really hinders the best part of the game, which is taking over enemy castles and towns.