Analysis of information sources in references of the Wikipedia article "Mongol military tactics and organization" in English language version.
Jengis Khan's successor, Ogdai Khan, continued his dazzling conquests. The Mongols brought with them a Chinese invention, gunpowder, at that time totally unknown to Europe. After the destruction of Kiev (1240) Poland and Silesia shared its fate, and in 1241 they crossed the Carpathians
The Mongols attacked using prisoners as body shields.