Subudai is really one of the unknown geniusses of military history. He was the most talented and trusted general of Genghis Khan. Unlike many of the other Mongol generals he was not from the nobility. One of his talents was his extraordinary memory. He could draw a mapof everywhere he has traveled. That is why he always led the vanguard or expedionary armies.

He was especially dangereous when he had shared command with Jebe Noyan (Noyan means noble). They were the best commander pair in the history. Subudai had extraordinary battlefield skills. And Jebe Noyan had the agressiveness and killing insticts. Also being good friends helped. I think no general from nobility other than Jebe wanted to work with Subudai.

They served together from China to Russia.
Subudai was the first Mogol commander who appreciated Chinese fire power.
Maybe one day I can write more detailly about them.