Historian Jack Weatherford said that the earliest incident of mass rape attributed to Mongols took place after Ogodei Khan sent an army of 25,000 soldiers to North China, where they defeated an army of 100,000. The Mongols were said to have raped the surviving soldiers at the command of their leader. Ogodei Khan was also said to have ordered mass rapes of the Oirat. According to Rogerius of Apulia, a monk who survived the Mongol invasion of Hungary, the Mongol warriors "found pleasure" in humiliating local women.