Batu's strategy was brutal in the extreme: any prisoners taken, whether by surrender or capture, were killed without exception. This was one reason why the Russian armies would not take him on lightly.
拔都所用的戰術相當殘酷，不論降與俘，一概不留活口，因此死屍遍野這也是俄羅斯大軍不敢輕攖其鋒的原因。