Playing the Mongols (trying for Khan of Khans, it was going very well until ~1260, so far I have taken all of the Persian empire except Mesopotamia, Cumania, Bulgaria, Hungary, Bohemia ("sniped" from a HRRevolt), Croatia, Poland, Pomerania and Denmark (Denmark owned a duchy in Pom and I had just finished taking Poland, so...), recently won Germany along with most of Frisia and Lotharingia in my first war with HRE), the pope declared a crusade for Hungary when I was already completely overstretched fighting a very messy war against the HRE (was planning to annex them in one go so the work would pay off, peaced out for half their lands because the situation in Hungary was becoming dire) and various revolts in Persia and eastern Europe. Suddenly, I find Hungary flooded with at least 50k of those bastards, a Catholic uprising sieging my capital (I moved it up to Skane as that was the only completely coastal duchy I had with more than just 2 or 3 counties other than some crappy black sea ones and low tech... So anyway, this prevents me from spending my gold on mercs or Lords of the Sky to save the day as they would spawn in battle with 0 morale), Liberation revolts in Hungary (irrelevant, the uprising was a problem at first because everything I had was tied up by the HRE, swarming Catholics are far worse by now) and Cumania (12k in the middle of nowhere) I have no answer for. Khan is 70 with regular health and will probably die any second. My event troops that I had preserved so carefully for over 40 years are wiped out, my levies depleted (HRE sniped and butchered most of them with an Organizer while their other stack was keeping my retinue busy, most of what I had left got destroyed by high numbers (my actual Hungarian and Balkan levies quickly got overwhelmed when suddenly the 10k invaders had become 20 when I wasn't looking... yeah, I wasn't quite playing fully concentrated anymore) or overpowered Holy Orders (my 10k levies from Poland got attacked by 9k Teutons and were destroyed while the TO lost 1k at most) at equal numbers in Hungary while my retinue was still on the way), my remaining levies (now from northern Persia and eastern Cumania as all else is already dead - these levies were dealing with some nasty rebels (somehow half of Persia being Tengri by now doesn't seem to help much with those revolts, I still get them all the time) during the HRE war, but didn't suffer quite as much) and retinue are currently losing a battle against half the Catholic army (I tried to seperately attack a 10k army with my entire stack - unfortunately, that 10k was mostly the TO and they held out for far longer than they should have, mass reinforcements from 2-3 provinces away arrived and my precious HAs that had previously killed the HRE's masses at lesser numbers whenever they actually reached them after that damn Organizer had already killed everyone else in what was supposed to be a protected carpet siege of their eastern lands suddenly were losing...)
Is surrender an option so I can save my retinue (20k HAs, maybe half remaining), sort out my rebel and upcoming succession (my heir is a 20 Dip genius with lots of virtues and all of my vassals are Mongol/Tengri or at least Something/Tengri, but with hundreds of vassals and in such a weak state...) or will losing Hungary (geographically the heart of my empire, and my primary title even is a renamed Carpathia as that was the first non-tribal empire title I was able to form) to the annoying TO tear my realm apart beyond repair?
Also, was it foolish to attack the HRE before clearing out my backyard from Byzantines, Rum, that mess in southern Greece, the not quite as scary muslim blobs? After killing some of their armies (those armies replenished very quickly) in raids and while hostile in the Bohemia war with my at that time smaller retinue, I thought I could take them directly - which I could, but not without becoming scarily unstable and getting butchered by some random crusade from the other Catholics.
... or was cutting my greatest rival in half worth probably losing an importantly-located and actually already quite well retengrified kingdom?
E: Nevermind. I surrendered, stabilized, invaded new Hungary (the land was given to a claimant rather than the TO) as I didn't even have a truce, nobody helped them, done. By the time someone can call another crusade, they won't be able to stop me anymore. Khan is in his mid-70s and recently became posessed, wonder if I can actually do another major war with him if he continues to live like this.