Originally posted by Ian Montgomerie
It's more than a tactical issue of mobility - cavalry does have uses in western Europe. But the Mongols (and probably others) had issues with strategic mobility. Basically you need a lot of grassy plain type areas to breed and maintain a horse-based nomadic army over long periods. When the Mongols came to eastern Europe, they weren't going all-out to conquer Europe only to be turned back by a succession crisis. For them, Europe was verging on the ass end of nowhere. It's geographically disconnected from the main Eurasian steppe regions where they had the best mobility and the best environment for their horses. Logistically, it wasn't easy for them to mount operations into Europe, and even the parts that they did conquer were pretty far off from the main Mongol empire.
If I were making the argument for a long-term Mongol conquest, I'd agree. I don't believe the Mongols intended that. The original casus belli was King Bela of Hungary's allowing the Cumans who fled from Mongol domination sanctuary. The campaigns of 1241 were aimed at taking Hungary. Any subsequent campaigns would have been to deal with the armies of Germany and France that were coming to deal with them. I can see Batu's armies beating them, sacking some N. German cities (Lubeck, etc.). After 1242-43 the Mongols settle down, using Hungary as a western outpost of the Golden Horde and levying tribute from German and Polish principalities. My thought is that the Hungarian sub-khanate is smashed by the Europeans after 50-200 years. The main point of this TL isn't a Mongol conquest of Europe but how this Europe develops.
As to the terrain of this, the only thing I've been able to find is a line in the Cambridge Illustrated Medieval History that from 1100-1250, German land under settlement increased 40%. I found an online map that shows a large number of towns being founded in the 12th and early 13th centuries:
http://www.lib.utexas.edu/maps/historical/shepherd/german_settlements_800_1400.jpg
I don't see the substantiation for a Germany "totally covered by dense forest."
and the European armies will have to look for open terrain...
Originally posted by Abdul Hadi Pasha
contrary to how it looks in movies, the armies of the time had considerable foot components. In any case, irregular formations of anything are better suited to forests than ordered units.
Yes, I am fully aware of that. You can use the Battle of Bouvines as a good example of the organization of the armies. The German army had 11,000 heavy cavalry and 60,000 infantry while the French army had 11,000 heavy cavalry and 25,000 infantry. Note that the infantry were mainly pikemen which are close-order units, not at their best in a forest, and that the armies still use heavy armored cavalry, still not at their best in a forest.