A war is never pleasant, but a war is done to expand territories and to get the riches of the rival's land. Whoever loses, lose all and the one who wins gains more. In this game, you are a king, who had gone to war. Your objective is to defeat the rival king. You would need to make sure to defeat all of his subjects for you to win. The game would be harder as you make some progress, but that is the highlight of the game since that is what you play for. Your rival would do the same to you.