The 1987 Sino-Indian skirmish Hostile_encounter was the third military conflict Hostile_encounter between the Chinese People 's Liberation Army Ground Force and Indian Army that occurred Coming_to_be at the Sumdorong Chu Valley , with the previous one taking place Process_start almost a quarter of a century earlier .

In 1983 , an Intelligence Bureau team went to Motion the pasturage of Sumdorong Chu which is north-east of the confluence of the Namka Chu and Nyamjiang Chu .