In 1969, when the Sino-Soviet border defense situation escalated, Zhou Enlai called Pi Dingjun: You go to the Lanzhou Military Region to take office, foreword to the breakthrough in the Central Plains, and Zhou Enlai, who became famous in World War I, personally taught Pi Dingjun the policy of breaking the enemy and was ordered to be in danger, and he was responsible for the defense of the northwest and died unexpectedly

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