It looks like I have some reading to do now. This is a subject I find interesting. There was an article in National Geographic a while ago that went into detail of the things they found when divers brought up artifacts from the sea floor. Its been a long time since I read the article, so I can't give many details, but some things that surprised me was the fact that they had kilns and smiths on board the ships so they could work on weapons, armor and horse shoes while at sea. I knew the Mongols were big on horses, its just something I never really thought about until reading the article. After checking out the scroll and a little creative thought, it makes you wonder if the Mongols were asking themselves if invading Japan really was a good idea or not.
I know this is necro-posting, and for that I do apologize. But Saionji-Sensei, domo arigato gozaimasu! I actually spent a whole semester, 6 units on the Mongol invasion of Japan. The link you have posted would have been wonderful back in the day, and I am so excited to check this link out.
Sometimes, the search function on this forum really irks me, but then after all the strife I find posts such as this!