The Circassian genocide, or Tsitsekun, was the systematic mass killing, ethnic cleansing, and forced displacement of between 95% and 97% of the Circassian people during the final stages of the Russian invasion of Circassia in the 19th century. It resulted in the deaths of between 1,000,000 and 1.5 million and the destruction of Circassia, which was then annexed by the Russian Empire. Those planned for extermination were mainly the Circassians, who are predominantly Muslims, but other ethnic groups in the Caucasus were also affected, as part of the Caucasian War. The Imperial Russian Army also impaled their victims and tore open the bellies of pregnant women to intimidate the Circassians and devastate their morale. Many Russian generals, such as Grigory Zass, described the Circassians as "subhuman filth" and a "lowly race" to justify and glorify their wholesale slaughter and their use as human test subjects in unethical scientific experiments. Russian soldiers were also permitted to rape Circassian women.
The native Circassian population was largely decimated or expelled to the Ottoman Empire. Only those who accepted Russification and made agreements with Russian troops, were spared. Starvation was used as a tool of war against Circassian villages, many of which were subsequently burned down. Russian writer Leo Tolstoy reported that Russian soldiers attacked village houses at night. British diplomat Gifford Palgrave, stated that "their only crime was not being Russian." Seeking military intervention against Russia, Circassian officials sent "A Petition from Circassian leaders to Her Majesty Queen Victoria" in 1864, but were unsuccessful in their attempt to solicit aid from the British Empire. That same year, the Imperial Russian Army launched a campaign of mass deportation of Circassia's surviving population. By 1867, a large portion of the Circassians were expelled. Many died from epidemics or starvation. Some were reportedly eaten by dogs after their death, while others died when their ships sank during storms.