thats not strictly true, Eng - Scot wars ended through compromises, marriages or general backstabbery usually. James, i think 6 of Scot, was also James 1st or 2nd of England, due to marriage to.. someone?? anyways, he ended up ruling both nations, and thus peace, however cagey, was born.
Mid you, a bloke called Adrian decided to make a wall to keep them out, so he must have been scared of something, lol
Historically, Scotlands problem was the clans were forever fighting each other. If they had compromised, and stopped trying to backstab each other, and fought as one nation, then perhaps things would have been very different...