Correct, there were large-scale massacres accompanying these campaigns.
Exactly this was often achieved by large scale massacre
genghis khan did so much in history Well, I know that by uniting nomadic tribes of Northeast Asia, he was able to come to power. oh yea and he conquered so much so fast And he founded the Empire and was proclaimed "Genghis Khan". Impressive, right? Yes, but I believe there were massacres as well
These campaigns were often accompanied by large-scale massacres of the civilian populations – especially in the Khwarazmian and Western Xia controlled lands.