I recently started playing CKII, and I'm having some trouble understanding exactly how this works. I declared a holy war on Valencia, and besieged and occupied all of the lands there, but I'm still not able to enforce my demands. Do I also have to occupy the lands of all of the other Muslims that joined the holy war? Is there any way for me to predict before I start a war what lands I will have to occupy in order to enforce my demands?