In 1220 BC Genghis Khan led his Golden Horde of nomadic Mongols into central Asia. After attacking the armies of the Shah and sieging smaller cities, the Mongols aid siege to the capital city of Samarkand.
In a relatively short period of days the capital fell in March 1220. There followed the typical Mongol practice of sacking the city, sending artisans back to home, dividing the women & children amongst the Khan’s soldiers and butchering all who remained. The people of Samarkand (those remaining alive) were ordered to evacuate and assemble in a plain outside the city, where they were killed and pyramids of severed heads raised as the symbol of Mongol victory.
Later in 1220, the city of Urgency fell to the Mongols. As usual, the artisans were sent back to Mongolia, young women and children were given to the Mongol soldiers as slaves, and the rest of the population was massacred. The Persian scholar Juvayni states that 50,000 Mongol soldiers were given the task of executing twenty-four Urgench citizens each, which would mean that 1.2 million people were killed. While this is almost certainly an exaggeration, the sacking of Urgench is considered one of the bloodiest massacres in human history.
Nishapur and Herat fell in 1221 to armies led by the Khan’s son Tolui. At Nishapur a son-in-law of Genghis Khan was killed. The entire population was slaughtered down to the dogs and cats.
The Mongolians knew how to prevent local uprising in conquered territory…when they were gone they left only the dead behind. In Middle Eastern history the current combatants are real slackers.