I am playing as Aragon in early. It's been almost a century since the start of the game and I already firmly hold all Iberia, Northern Africa, the holy land, and pretty much everything the Byzantines had from Greece to everything surrounding the Black Sea and the Middle East, with the Biz cornered to (I think) only Bulgaria and Rhodes. Having newly (within the last 25 years) conqured all these provinces, every Byzantine victory seems to push loyalty into the ground, but I can easily put down these minor rebellions, and once I had defeated the Byzantines, everything would be smooth sailing for awhile. Then the Turks reappeared. Suddenly Edessa is filled with 5 full banners of pissed off Turks (the Byzantines eliminated you! Really! I just took your land from them! They don't seem to care.) Now loyalty is down all over the Middle East. I wasn't sure what to do. My forces were spread out a lot, so I couldn't get a reasonable fighting force there quickly. I decided to just leave a unit in the stronghold to buy time in hope they wouldn't assault. Now it's the next turn, and I'm not sure what to do. I've got a crusade in Morocco ready to be launched, but due to Byzantine ships it will take at least 2 turns for the path to be cleared to land in Tripoli. Meanwhile, every province bordering Edessa is at extreme loss to loyalty. I'm about to lose half my empire. Help?

PS

I'm not nearly as good with battles in Medieval as I am in Rome, so I usually auto-resolve. Any idea how 1 defender in Bulgaria killed 475 besiegers all by his lonesome?