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Allied occupation and atrocities

The Eight Nation Alliance occupied Zhili province while Russia occupied Manchuria, but the rest of China was not occupied due to the actions of several Han governors who formed the Mutual Protection of Southeast China that refused to obey the declaration of war and kept their armies and provinces out of the war. Zhang Zhidong told Everard Fraser, the Hankou-based British consul general, that he despised Manchus so that the Eight Nation Alliance would not occupy provinces under the Mutual Defense Pact.

Beijing, Tianjin and Zhili province were occupied for more than one year by the international expeditionary force under the command of German Field Marshal Alfred von Waldersee, who had initially been appointed commander of the Eight-Nation Alliance during the rebellion but did not arrive in China until after most of the fighting had ended. The Americans and British paid General Yuan Shikai and his army (the Right Division) to help the Eight Nation Alliance suppress the Boxers. Yuan Shikai's forces killed tens of thousands of people in their anti-Boxer campaign in Zhili Province and Shandong after the Alliance captured Beijing. The majority of the hundreds of thousands of people living in inner Beijing during the Qing were Manchus and Mongol bannermen from the Eight Banners after they were moved there in 1644, when Han Chinese were expelled. Sawara Tokusuke, a Japanese journalist, wrote in "Miscellaneous Notes about the Boxers" about the rapes of Manchu and Mongol banner girls. He alleged that soldiers of the Eight-Nation Alliance raped a large number of women in Peking, including all seven daughters of Viceroy Yulu of the Hitara clan. Likewise, a daughter and a wife of Mongol banner noble Chongqi of the Alute clan were allegedly gang-raped by soldiers of the Eight-Nation Alliance. Chongqi killed himself on 26 August 1900, and some other relatives, including his son, Baochu, did likewise shortly afterward.

During attacks on suspected Boxer areas from September 1900 to March 1901, European and American forces engaged in tactics which included public decapitations of Chinese with suspected Boxer sympathies, systematic looting, routine shooting of farm animals and crop destruction, destruction of religion buildings and public buildings, burning of religious texts, and widespread rape of Chinese women and girls.

Contemporary British and American observers levelled their greatest criticism at German, Russian, and Japanese troops for their ruthlessness and willingness to execute Chinese of all ages and backgrounds, sometimes burning villages and killing their entire populations. The German force arrived too late to take part in the fighting but undertook punitive expeditions to villages in the countryside. According to missionary Arthur Henderson Smith, in addition to burning and looting, Germans "cut off the heads of many Chinese within their jurisdiction, many of them for absolutely trivial offenses". US Army Lieutenant C. D. Rhodes reported that German and French soldiers set fire to buildings where innocent peasants were sheltering and would shoot and bayonet peasants who fled the burning buildings. According to Australian soldiers, Germans extorted ransom payments from villages in exchange for not torching their homes and crops. British journalist George Lynch wrote that German and Italian soldiers engaged in a practice of raping Chinese women and girls before burning their villages. According to Lynch, German soldiers would attempt to cover up these atrocities by throwing rape victims into wells as staged suicides. Lynch said, "There are things that I must not write, and that may not be printed in England, which would seem to show that this Western civilisation of ours is merely a veneer over savagery".

On 27 July, during departure ceremonies for the German relief force, Kaiser Wilhelm II included an impromptu but intemperate reference to the Hun invaders of continental Europe:

Should you encounter the enemy, he will be defeated! No quarter will be given! Prisoners will not be taken! Whoever falls into your hands is forfeited. Just as a thousand years ago the Huns under their King Attila made a name for themselves, one that even today makes them seem mighty in history and legend, may the name German be affirmed by you in such a way in China that no Chinese will ever again dare to look cross-eyed at a German.

One newspaper called the aftermath of the siege a "carnival of ancient loot", and others called it "an orgy of looting" by soldiers, civilians and missionaries. These characterisations called to mind the sacking of the Summer Palace in 1860. Each nationality accused the others of being the worst looters. An American diplomat, Herbert G. Squiers, filled several railway carriages with loot and artefacts. The British Legation held loot auctions every afternoon and proclaimed, "Looting on the part of British troops was carried out in the most orderly manner." However, one British officer noted, "It is one of the unwritten laws of war that a city which does not surrender at the last and is taken by storm is looted." For the rest of 1900 and 1901, the British held loot auctions every day except Sunday in front of the main-gate to the British Legation. Many foreigners, including Claude Maxwell MacDonald and Lady Ethel MacDonald and George Ernest Morrison of The Times, were active bidders among the crowd. Many of these looted items ended up in Europe. The Catholic Beitang or North Cathedral was a "salesroom for stolen property". The American general Adna Chaffee banned looting by American soldiers, but the ban was ineffectual. According to Chaffee, "it is safe to say that where one real Boxer has been killed, fifty harmless coolies or laborers, including not a few women and children, have been slain".

A few Western missionaries took an active part in calling for retribution. To provide restitution to missionaries and Chinese Christian families whose property had been destroyed, William Scott Ament, a missionary of American Board of Commissioners for Foreign Missions, guided American troops through villages to punish those he suspected of being Boxers and confiscate their property. When Mark Twain read of this expedition, he wrote a scathing essay, "To the Person Sitting in Darkness", that attacked the "Reverend bandits of the American Board," especially targeting Ament, one of the most respected missionaries in China. The controversy was front-page news during much of 1901. Ament's counterpart on the distaff side was British missionary Georgina Smith, who presided over a neighbourhood in Beijing as judge and jury.

While one historical account reported that Japanese troops were astonished by other Alliance troops raping civilians, others noted that Japanese troops were "looting and burning without mercy", and that Chinese "women and girls by hundreds have committed suicide to escape a worse fate at the hands of Russian and Japanese brutes". Roger Keyes, who commanded the British destroyer Fame and accompanied the Gaselee Expedition, noted that the Japanese had brought their own "regimental wives" (prostitutes) to the front to keep their soldiers from raping Chinese civilians.

The Daily Telegraph journalist E. J. Dillon stated that he witnessed the mutilated corpses of Chinese women who were raped and killed by the Alliance troops. The French commander dismissed the rapes, attributing them to "gallantry of the French soldier". According to U.S. Captain Grote Hutcheson, French forces burned each village they encountered during a 99-mile march and planted the French flag in the ruins.

Many bannermen supported the Boxers, and shared their anti-foreign sentiment. Bannermen had been devastated in the First Sino-Japanese War in 1895 and Banner armies were destroyed while resisting the invasion. In the words of historian Pamela Crossley, their living conditions went "from desperate poverty to true misery". When thousands of Manchus fled south from Aigun during the fighting in 1900, their cattle and horses were stolen by Russian Cossacks who then burned their villages and homes to ashes. Manchu Banner armies were destroyed while resisting the invasion, many annihilated by Russians. Manchu Shoufu killed himself during the battle of Peking and the Manchu Lao She 's father was killed by Western soldiers in the battle as the Manchu banner armies of the Center Division of the Guards Army, Tiger Spirit Division and Peking Field Force in the Metropolitan banners were slaughtered by the western soldiers. The Inner-city Legation Quarters and Catholic cathedral (Church of the Saviour, Beijing) were both attacked by Manchu bannermen. Manchu bannermen were slaughtered by the Eight Nation Alliance all over Manchuria and Beijing because most of the Manchu bannermen supported the Boxers. The clan system of the Manchus in Aigun was obliterated by the despoliation of the area at the hands of the Russian invaders. There were 1,266 households including 900 Daurs and 4,500 Manchus in Sixty-Four Villages East of the River and Blagoveshchensk until the Blagoveshchensk massacre and Sixty-Four Villages East of the River massacre committed by Russian Cossack soldiers. Many Manchu villages were burned by Cossacks in the massacre according to Victor Zatsepine.

Manchu royals, officials and officers like Yuxian, Qixiu, Zaixun, Prince Zhuang and Captain Enhai were executed or forced to commit suicide by the Eight Nation Alliance. Manchu official Gangyi 's execution was demanded, but he already died. Japanese soldiers arrested Qixiu before he was executed. Zaixun, Prince Zhuang was forced to commit suicide on 21 February 1901. They executed Yuxian on 22 February 1901. On 31 December 1900 German soldiers beheaded the Manchu captain Enhai for killing Clemens von Ketteler.