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In page Sino-Indian War:

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At 5:14 am, Chinese mortar fire began attacking the Indian positions. Simultaneously, the Chinese cut the Indian telephone lines, preventing the defenders from making contact with their headquarters. At about 6:30 am, the Chinese infantry launched a surprise attack from the rear and forced the Indians to leave their trenches.[1] The Chinese overwhelmed the Indian troops in a series of flanking manoeuvres south of the McMahon Line and prompted their withdrawal from Namka Chu.[1] Fearful of continued losses, Indian troops retreated into Bhutan. Chinese forces respected the border and did not pursue.[citation needed] Chinese forces now held all of the territory that was under dispute at the time of the Thagla Ridge confrontation, but they continued to advance into the rest of NEFA.[1]