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The Boxers regularly attributed the casualties they suffered in fighting with foreigners in Tianjin to the latter’s placement of naked women in the midst or in front of their forces, which broke the power of the Boxers’ magic. The story was also circulated and widely believed by the populace that a naked woman straddled each of the many cannons mounted in the foreign buildings in Zizhulin making it impossible for the “gunfire-repelling magic” (bipao zhi fa) of the boxers to work properly. (Paul A. Cohen. History in Three Keys: The Boxer Uprising as Event, Experience and Myth. Columbia University Press. 1997. p. 131).

Apparently the government eventually caught on to it and started enlisting prostitutes to terrorize the rebels: When this proposal was carried out and proved effective, the government side adopted additional measures of a like sort including, as later recounted by Wang Lun himself, "women wearing red clothing but naked from the waist down, bleeding and urinating in order to destroy our power."
Wizard Powers are a fickle thing indeed.