麦克马洪线
In November 1961, Nehru formally adopted the "Forward Policy" of setting up military outposts in disputed areas, including 43 outposts north of Zhou's LAC. On 8 September 1962, a Chinese unit attacked an Indian post at Dhola in the Namka Chu valley immediately south of the Thag La Ridge, seven kilometres north of the McMahon Line according to the map on page 360 of Maxwell. On 20 October China launched a major attack across the McMahon Line as well as another attack further north. The Sino-Indian War which followed was a national humiliation for India, with China quickly advancing from the McMahon Line to Rupa and then Chaku (65 km southeast of Tawang) in NEPA's extreme western portion, and in the NEFA's extreme eastern tip advancing to Walong. The Soviet Union, United States, and Great Britain pledged military aid to India. China then withdrew to the McMahon Line and repatriated the Indian prisoners of war (1963). The legacy of the border remains significant especially in India where the government sought to explain its defeat by blaming it on being caught by surprise.