Well the easiest option is to declare war on the crusading faction but that could be quite disasterous if you lack troops in the area.
The same thing happened to me once as the Hungarians as many crusades pass that way. If you can afford to move all your decent troops out and place peasents to make up the numbers then it will save you losing good soldiers. Eventually the crusade will disapear as men leave a crusade if it is going nowhere. However this can take a long time.
The last option is to invade the province they are trynig to progress to as their army moves in. Together you can win the province and let him take the land. If you're feeling very generous.
__________________
\"There shall be no mercy for those who challenge my fight for conquest. Heed this warning!\"-General Nosaj
|