The
tactics of "
controlling foreigners by foreigners" was posed by Chaocuo in the earlier
stage of Western Han Dynasty.The tactics had not been brought into fact because of the limt of national power,it started to be performed from Emperor Wu of
the Han Dynasty to the late stage of Western Han Dynasty,in the Eastern Han Dynasty it had been in the stage of wide performance.There were a few reasons as follows:(1)People in the interior
counties must garrison the frontiers for a year according to the conscription system,and couldn't meet the needs of war;(2)"
Controlling Foreigners by foreigners" would be no labour of expedition;(3)The government of Eastern Han Dynasty dismissed officers and soldiers stationing pavilion and watchtower in the frontier counties,and relay on foreign soldiers to control foreigners.In addiction,there were positive factors ,contradiction,conflict and weaknesses between minority nationalities which would be used perpetually.Therefore,the development of "controlling foreigners by foreigners"during the Hans conformed to the rule.
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