nechaev 's rampage men vented fury sacking especially brutal manner nearest town ref name fenby jonathan p another group russians wore tartar hats traditional dark greycoats fought marshal zhang zuolin old marshal ruled manchuria ref name fenby jonathan p russian mercenaries considerable effectiveness ill trained armies chinese warlords one contemporary mentioned marshal zhang 's russians went chinese troops like knife butter ref name fenby jonathan p early stages second sino japanese war number foreign
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