They led their own wars to expand the size of the empire.
Explanation:
Ögedei was the third son of Genghis Khan and second Great Khan of the Mongol Empire,succeeding his father. He continued the expansion of the expansion of the empire that his father had begun,..... After destroying the Khwarazian empire,Genghis Khan was free to move on. After subduing Armenia,Chormaqan took Tiflis.