You can keep a clean conscience on this one - it's a false moral choice <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />
The defending king is protecting his people; the invading king is willing to try nothing except putting a peaceful people to the sword. No trading, no ship building or seeking new lands, no leading his people peacefully to a new territory - only war!
The defending king is clearly occupying the moral high ground. I had NO qualms <img src="/ubbthreads/images/graemlins/smile.gif" alt="" />