Playing campaign game as Britain.
Spain declares war on Portugal. I declare war on Spain and take Madrid and a couple other cities. Spain offers Peace and I accept. Spain continues to fight Portugal, even sending troops through areas my forces are located.
My suggestion for the game is that there's an event that could fire in the event of Peace between Spain and England, that could result in Peace between Portugal and Spain. Obviously I wouldn't say 100% chance but just to me I wouldn't think Portugal would want to go it alone against Spain, though I could be wrong.
Thanks