Dzungar genocide
I surf Wikipedia and learned this last night. The Uyghurs were among the tribes and nations recruited by the Chinese to destroy the Dzungars, formerly the abusive overlords of the Uyghurs.
"the Qing victory was, in a certain sense, a victory for Islam".
Okay, so nobody could ever trust historical allies, but technology amplifies power to the point / risk of total domination.