Longju

The McMahon Line as drawn in 1914

The McMahon Line depicted in a Survey of India map of 1940 (noted as approximate)

The border drawn by the US Office of Geographer (in blue) approximates the 1914 McMahon Line. The Line of Actual Control in 2020 drawn by OpenStreetMap is in green.

During the negotiations for the McMahon Line in 1914, the British Indian negotiators were congnisant of the fact that Migyitun was Tibetan and also that the neighbouring Dakpa Sheri mountain (to the west) was regarded by them as a holy mountain. Taking these factors into account, they promised that the border would be drawn short of the high ridge line, and avoid including the annual pilgrimage route in Indian territory as far as practicable.[19]

These arrangements were confirmed in the notes exchanged between McMahon and Lonchen Shatra and the border line was drawn accordingly. The line avoided both the north-south ridge line (which would have placed Dakpa Sheri on the border) and the east-west ridge line (which would have placed Migyitun on the border), and cut across the region along a diagonal. A suitable buffer south of Migyitun was included within Tibet, but not so much as to include the confluence of the Mipa Chu river with Tsari Chu. McMahon believed that there was a "wide continuous tract of uninhabited country" along the south of the watershed.[20]

As per the US Office of Geographer's "Large-Scale International Boundaries" (LSIB) database, the McMahon Line of the treaty puts Longju in Tibetan territory.[21]

For various diplomatic reasons, the McMahon Line remained unimplemented for a couple of decades. It was revived in 1930s by Olaf Caroe, then Deputy Foreign Secretary of British India. The notes exchanged between McMahon and Lonchen Shatra were published in a revised volume of Aitchison's Treaties and maps were revised to show the McMahon Line as the boundary of Assam. The Surveyor General of India made adjustments to the McMahon Line boundary "based on more accurate topographical knowledge acquired after 1914". But he left certain portions approximate as he did not have enough inforation. Scholar Steven Hoffmann remarks that Migyitun, Longju and Thagla Ridge (in Tawang) were among such places.[22]

The maps drawn from 1937 onwards show the boundary tend more towards the watershed near Migyitun than the original treaty map. The Dakpa Sheri mountain and the pilgrimage route are still shown entirely within Tibetan territory. But, at Migyitun, the border is immediately to its south, evidently putting Longju within Indian territory.[lower-alpha 5] This is the correct ethnic frontier, according to scholar Toni Huber.[4]

NEFA in the 1954 Survey of India map, the first fully demarcated map of the frontier

After India became independent 1947, it slowly extended its administration to all the remaining areas of the North-East Frontier. The Subansiri area was renamed Subansiri Frontier Division and officers were posted to remote areas. Schools and medical centres were opened. Verrier Elwin, an authority on Indian tribal communities, stated "wars, kidnappings and cruel punishments... have come to an end".[23]

In 1950, Tibet came under Chinese control but, at least initially, this made little difference to the relations between the Tibetans and Tagin tribes. In 1956, the Tibetans conducted the long pilgrimage of the Dakpa Sheri mountain called Ringkor as per their 12-year cycle. The procession went through the tribal territory (along the Tsari Chu river till its confluence with Subansiri and then upstream along Subansiri or "Chayul Chu"). It passed without any incidents from the tribals. The Tibetans paid them the usual 'tribute' to let the procession pass unmolested, but also armed Indian border troops were stationed in the Tsari Chu valley south of the Mandala Plain.[24][6]

Scholar Toni Huber reports that there was a 'foreign presence' in Tsari in terms of several small Chinese medical teams sent by Chinese administrators in Lhasa. The medical teams set up camp in the Mandala Plain and other locations on the Tibetan side of the border. They treated any assembled pilgrims that were sick and dispensed medicines. After the procession departed, they left. Tibetans later suspected that these apparently innocent medical teams represented reconnaissance teams sent in advance of the later Chinese encroachments in the border area in 1959.[25]

NEFA in a 1959 map of India, highlighting the disputed locations

By the beginning of 1958, China had completed the Aksai Chin Road and obtained the capacity for large-scale troop movement into Tibet.[26] In March 1959, an uprising erupted in Tibet, and troops moved in to quell it. The PLA was deployed along the McMahon Line,[27] and four regiments were deployed in the Shannan region bordering Subansiri and Kameng Divisions.[18][28] In response, India set up advance posts manned by Assam Rifles[lower-alpha 6] along the border. The two places where the map-drawn McMahon Line differed from the prevailing ethnic frontier, the Khinzemane post along the Nyamjang Chu river valley and Longju in the Tsari Chu valley, came in for contestation. The Chinese suppression of the Tibetan uprising and India's decision to grant asylum to the Dalai Lama inflamed the public opinion on both sides.[30]

On 23 June, China handed a protest note to the Indian embassy in Beijing, alleging that hundreds of Indian troops had intruded into and occupied Migyitun (among other places). Migyitun is said to have been "shelled" and the Indian troops were alleged to be working in collusion with "Tibetan rebel bandits". The Indian government denied that any such actions took place.[31] There is no record of any Tibetan armed resistance operating in the Migyitun area.[25] Evidently, the Chinese were highlighting the discrepancy between the map-marked McMahon Line and the Indian-claimed border.

On 7 August, a Chinese contingent numbering 200 troops challenged the Indian post at Khinzemane and pushed it back behind the perceived McMahon Line.[32] At Longju, "actual fighting" broke out.[30]

Reports state that a Chinese force of two to three hundred men was used to drive out the Indian border post from Longju.[33] On 25 August, they surrounded a forward picket consisting of 12 personnel (one NCO and 11 riflemen)[34] and fired upon it killing one and wounding another. The rest were taken prisoner and some escaped.[35] The following day, the Longju post itself was attacked with overwhelming force. After some fighting, the entire Longju post withdrew to Daporijo.[36] Chinese troops began to entrench themselves at Longju, digging mines and building airfields, demarcating it as their territory.[37]

When the Indian government protested about the incident, the Chinese replied that it was the Indian troops that opened fire and "withdrew subsequently on their own accord".[38][34] They also said that Longju was in Tibetan territory according to the McMahon Line.[30]

The Indian media reported the 25 August attack on Longju on 28 August 1959. Nehru faced questions in the parliament on the same day. He revealed that serious border incidents occurred between India and China along the Tibet border. Nehru went on to reference four cases: Aksai Chin Road, Pangong Lake area, Khinzemane and Longju.[39] He also announced that the border would be the responsibility of the military from then onwards.[40][41]

The Longju incident came on top of numerous questions being raised in India based on leaks and news reports. In order to stem the "tide of criticism", Nehru had decided to publish the entire correspondence with the Chinese government as a "white paper". The first of these appeared on 7 September. In due course the white papers would severely restrict Nehru's room for diplomatic manoeuvre.[42]

On 8 September, Nehru received a reply from the Chinese Premier Zhou Enlai to his letter from March quizzing about the Chinese maps claiming Indian territory. Zhou stated that the maps were "substantially correct", thereby laying claim to the entire state of Arunachal Pradesh as well as Aksai Chin.[43] (Until this point Zhou had been claiming that PRC was just reprinting the old Kuomintang maps and hadn't had the time to examine the boundary question.)[44]

In the same letter, Zhou also proposed that border differences should be settled through negotiations and that the "status quo" should be maintained until such settlement.[45][46][lower-alpha 7] Nehru accepted the proposition in his response, indicated that the Indian forces would withdraw from Tamaden—another location where the McMahon Line was contested—and invited Zhou to do the same at Longju, while reassuring him that the Indian forces would not reoccupy it.[50] The Chinese forces are said to have subsequently withdrawn from the Indian post at Longju, but remained in force at Migyitun.[lower-alpha 8]

On 2 October 1959, a discussion took place between Soviet and Chinese delegations in which Khrushchev asked Mao "Why did you have to kill people on the border with India?" to which Mao replied that India attacked first. Zhou Enlai, also present at the discussion then asked Khrushchev "What data do you trust more, Indian or ours?" Khrushchev replied that there were no deaths among the Chinese and only among the Hindus.[51]

Scholar Stephen Hoffmann states that while the Indians were trying to strengthening the NEFA frontier, the Chinese were engaged in "militairzing" it. Since the Indian-claimed border was undemarcated and the Chinese troops were convinced of links between the Indians and the hostile Tibetans, incidents were bound to occur.[30]

Vertzberger notes that the Longju incident took place in the larger context of deteriorating relations between China and India. China was suspicious of India's support of Tibetan activities while India was witnessing an aggressive China which was completely disregarding the 1951 agreement. The incident marked the transition in China–India relations from "verbal to physical violence".[52]

On 29 August 1959 Assam Rifles set up a new post 10 kilometres (6.2 mi) south of Longju at Maja.[41]

In January 1962, the village of Roi[lower-alpha 9] half a mile south of Longju, manned by 50 Assam Rifles personnel, was also taken control of by the Chinese.[54][53]

After the 1962 war, India and China continued to blame each other in correspondence over Longju and other sensitive areas. On 25 June 1963, in a reply note to India, China said that its "frontier guards have long since completely withdrawn from the twenty-kilometre zones on the Chinese side of the line of actual control of November 7, 1959. As for Longju, it has always been part of China's territory [...] However, in order to create an atmosphere conducive to direct negotiations between the two sides, China has vacated it as one of the four disputed areas and has not even established any civilian checkpost there."[55]

On 10 December 1965, India reported that 400 Chinese troops entered into Longju area and intruded to a depth of 2 miles into the Subansiri district.[56] This was part of a larger series of incursions spanning the western, middle and eastern sectors.[57]