You are Kalittare the youngest of all the sultans of Persia. A Mongol scout has been spotted, further investigation has found that a Mongol presence that might pose a threat. You have a duty to erradicate this presence before it becomes a major threat to the oncoming armies of Persia.
This was a big disappointment. It could have been much more challenging, with enemy troops attacking whilst building up defences etc, plus I'm not going to destroy even houses for your victory conditions.