Subutai pioneered the use of siege weaponry and military intelligence. He always found out what tactics the opponent used before devising his own, which enabled him to come up with the most effective counterattacks. He constantly taught himself new things by consulting with engineers and wise men alike, until he became a whirlwind of military knowledge that was thought to be completely unstoppable.
When Genghis Khan died during the conquest of China and his son Ogedai replaced him, Subutai continued to serve him. Together, Ogedai and Subutai turned their attention toward Europe. They defeated a few armies and were just gearing up to invade Central Europe when Ogedai died in 1241. In a massive stroke of luck for Europe, his successor, Guyuk Khan, removed Subutai from the European front for political reasons and sent him to China. Subutai, 70 years old at the time, obliged, battling in China for a year before returning back home to die of old age
