the caravan mini game was a basic script that would generate an army and general and then tell it to move from it start point to a city with a port. In the crusader campaign you would have to destroy the army, and if you did you got extra gold. In the saracen campaign you had to escort it to the port. If it reached the destination you got extra gold. Its being left out not because of complexity (its a rather simple script) but because of time restraints.