Hire a henchman to go to Edward II's chambers and murder him. It won't be long before he looks to the north.
You have no quibble with Edward II. Rumour has it he's a bit of a push-over. You attempt to strike an alliance with him. This would be a peaceful end to the tyranny and bloodshed that has torn Scotland apart for years.
With Edward II's withdrawal, you should make the most of this opportunity. There is plenty of land still to cover.
Which card will you play?