Hard to say whether the Mongols would have conquered Japan.
I don't think the biggest problem for the Mongols are the mountains. They conquered Korea, the Caucasus, the Iranian Plateau and made their way into North Afghanistan. They were not just horsemen... Armies of their conquered realms (notably chinese) were the backbone Kublai's armies by this time.
Rather, I would suggest that the most determining factor would be the weaker support of the armies due to the fact that Japan is an Archipel. This makes it harder to field siege engines (Chinese and Muslim siege engineers played a very big part in the success of the Mongols in mainland Eurasia). I guess Japan was also able to use an efficient fleet, quite adapted to fighting across different islands. And the Japanese would be far more experienced doing this.
I don't think the biggest problem for the Mongols are the mountains. They conquered Korea, the Caucasus, the Iranian Plateau and made their way into North Afghanistan. They were not just horsemen... Armies of their conquered realms (notably chinese) were the backbone Kublai's armies by this time.
Rather, I would suggest that the most determining factor would be the weaker support of the armies due to the fact that Japan is an Archipel. This makes it harder to field siege engines (Chinese and Muslim siege engineers played a very big part in the success of the Mongols in mainland Eurasia). I guess Japan was also able to use an efficient fleet, quite adapted to fighting across different islands. And the Japanese would be far more experienced doing this.
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