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In page Sino-Indian War:

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On 10 July 1962, 350 Chinese troops surrounded an Indian post in Chushul (north of the McMahon Line) but withdrew after a heated argument via loudspeaker.[3] On 22 July, the forward policy was extended to allow Indian troops to push back Chinese troops already established in disputed territory.[4] Whereas Indian troops were previously ordered to fire only in self-defence, all post commanders were now given discretion to open fire upon Chinese forces if threatened.[4] In August, the Chinese military improved its combat readiness along the McMahon Line and began stockpiling ammunition, weapons and fuel.[citation needed]