Straw man argument. Why should we waste gold on caravans and take precious food away from our realm to make an attack, simply because one of our allies signed a silly treaty without consulting us beforehand? And we brought almost 20,000 CS in a single army, almost all heavy infantry with numerous siege engines. But that doesn't help us much when the only way to our enemy's land is through a 30,000 CS army behind a palisade, again because our allies signed a silly treaty without consulting us.