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In the 13th century, Batu Khan spent two months trying to take the city of Kozelsk. He lost many men and siege engines in the process. When he finally took it, he killed all the defendants, including women and children, and ordered the name of Kozelsk to be forgotten. He called it the Fierce City.
https://www.pb-31.ru/uznajte-bolshe-o-trejdinge-s-kriptovaljutami/