O.O Thanks for the tips!
It wouldn't let me disembark though. Only thing I can think of is maybe is because I had an alliance with the one English king who had the guy I was trying to attack as a vassal but I don't know how the boobnugget can attack me then. Weird.
I will try some sneaksy tricks and see what may come. Or I might just play the Game of Thrones version for shits and giggles