It’s an unnecessary nitpick. You don’t need to write an essay every time you mention that the Romans are good for example because 90% of the forum has a fairly good idea of what they are capable of. Same deal with the Mongols.
How is that any different from standard warfare by Western/Central European rulers? You still raid the lands of your enemies, but how often does that translate into real control?
In the case of Mongols, it resulted in the greatest land empire.
The English launched massive Chevauchees throughout France. It didn’t convince many French lords to defect over to the English side despite similarities in culture, religion, and the English king actually having a fairly good claim on the French throne.
These chevauchees were anything but “massive” and they were quite different from the Mongolian
conquest campaigns. Besides, the Black Prince & Co had in their disposal pretty much the same feudal bands strengthened by the archers while the Mongols had a regular army.
Besides, the comparison is not relevant on two accounts:
1. The English were quite successful in attracting quite a few “French lords” on their side. You can start with the Dukes of Burgundy.
2. The Kings of England had been pretenders to the French throne. The Mongols more often than not did not replace the local rulers. Their demand was to acknowledge Khan’s supremacy and to pay tribute. Worked in the Russian lands, Caucasus, Asia Minor, Outremer, Armenia Minor and other places. Frederick II seemingly did not consider this such a terrible option either.
Even with some lord defecting, you still have to somehow take the castles of opposing lords.More importantly, a lot of lords and especially the Emperor had no real capital to speak of. They could flee to another castle behind the enemy approaches. Because of how many fortresses individual lords have, they may also renege on deal they made with the Mongols as soon as they left the area, and the Mongols would have a difficult time going after said fortresses once they come back. The lords have perfected this cat and mouse game with their liege lord, especially in the HRE. They submit to the Emperor, and rebel once more as soon as the Emperor is out of the earshot.
An argument that the German “lords” were just a bunch of suicidal maniacs living in a vacuum of their castles isolated from the rest of the world is quote old. To start with, most of the “lords” did not have numerous castles and none of them had unlimited number of them. So if a lord flees before the enemy approaches and the garrison is offered reasonably good terms, why would it be suicidal if the lord abandoned them? Then, following this logic, the enemy does not have to bother about these ‘other’ castles, he just have to take the last one in which the lord hides.
Then, the lords do not live off the castle. They live off the land and, of they are important enough, off the cities. And it is expected that the lord is providing a protection for his feudal underlings and the cities because if he does not, they have a right to change their affiliation. So there is no need to bother excessively about chasing a specific lord. It is enough to cause enough damage and he will be forced to go to the field. Worked in Rus, Poland, Hungary, etc. BTW, FII and his son Henry had been raising some troops in Germany by exactly that reason: the lord had to protect his subjects. It is anybody’s guess how things would progress if the Western campaign proceeded but diplomatic solution is not out of the question: FII did not kill the Mongolian ambassadors, did not directly reject the idea and had been friendly to them.
The issue in the HRE is that even if a Duke agreed to betray the emperor, the count/baron under him might not and could keep resisting,
Resisting to whom? If the overlord makes a deal his territory is left untouched and his vassals are exclusively his problem unless he explicitly asks for the Mongolian help against specific underling.
and there is strong religious motivation to legitimise such a thing.
Religious aspect is absent because the Mongols were required to respect all the religious institutions and exempted them from the usual taxation.
The whole place is completely decentralised.
Sorry, but this picture of the HRE is not serious.
If the Mongols actually invade the HRE, the Emperor and the Pope will agree on one thing for once.
They did not and did not have reason because one who makes a deal first wins. And at least FII was pragmatic enough to make a deal.
Because many of those places were not decentralised to the degree of the HRE, especially in China, and the huge fortified cities you mentioned are far more vulnerable to sieges than the castles of Europe.
There were plenty of big cities in the Western Europe and the Russian princedoms were anything but centralized. I already addressed the castles issue.
In a European castle,you only need to feed the lord’s family, the servants and the garrison.
And the local peasants who are fleeing to its defense as soon as the enemy approaches. And in your schema who will keep feeding the lord and the garrison after enemy kills all his peasants or takes them prisoners and burns the countryside to the ground? The Mongols had been quite effective in doing these things and the slaves had been a valuable commodity.