give reason . Ala-ud-din made strong arrangements to check the Mongols.
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Answer:
The Mongols did not just invade and conquer; they exterminated civilisations. To give just an idea, during Genghis’s invasion of the Persian Empire, these were the number of people put to death in some of the cities overcome by the Mongols in 1222 CE: Urgench, 1 million; Merv, 700,000; Nishapur, 1.7 million; Rey, 500,000 (an estimate based on the order that every male should be killed in a city of approximately a million people); and Herat, 1.6 million. That’s nearly 6 million people just from these cities, at a time when the world population is estimated at 400 million. In other words, the Mongols are said to have killed 1.5% of the world population in a single campaign.
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