Sino-Indian War

The Sino-Indian War, sometimes called the China–India War or the Indo-China War, was a military clash between China and India that lasted from October into November 1962. It grew out of a long-running border dispute, with most of the fighting happening in two areas roughly 1,000 kilometers apart: India’s North-East Frontier Agency (NESA) and the Aksai Chin region. Both sides claimed these territories, but they based their claims on different historical border lines. India accepted the Johnson Line in the west and the McMahon Line in the east; China rejected both.

Tensions had been building since the 1959 Tibetan uprising, when India gave asylum to the 14th Dalai Lama. A series of small border clashes followed. Bilateral talks failed to settle the dispute, and China’s construction of a strategic road through Aksai Chin made things worse. Chinese military actions became more aggressive after India turned down proposed diplomatic solutions between 1960 and 1962. In April 1962, China resumed “forward patrols” in Ladakh, which it had previously stopped. By September and October, the situation grew especially tense at Dhola Post and Thagla Ridge on the eastern front. India believed the McMahon Line ran along that ridge; China disagreed. After several skirmishes, Chinese forces gained the upper hand, and by October 18, China had gathered a large number of troops for a major attack.

On October 20, 1962, China abandoned all attempts at a peaceful resolution and launched simultaneous offensives in NESA (the eastern front) and Aksai Chin (the western front). Chinese troops overran Indian Army positions at Namka Chu and Tawang in the east, and at Chip Chap Valley and Pangong Lake in the west, forcing Indian forces to retreat after heavy fighting. After a three-week pause, China attacked again on November 14, capturing key positions at Se La, Bomdila, and Gurung Hill on the eastern front. On the western front, fierce battles at Rezang La and Gurung Hill caused heavy casualties on both sides. The war ended when China unilaterally declared a ceasefire on November 20, 1962, and announced it would pull back to its pre-war positions, which became the effective border.

Much of the fighting was mountain warfare at altitudes over 5,000 meters (16,000 feet). The war was fought entirely on land, with no naval or air involvement. Neither side officially declared war or broke off diplomatic relations. For India, the conflict was a major military and political setback. In response, India quickly modernized and expanded its armed forces and strengthened border defenses. It also reassessed its policy toward China, and the war permanently damaged relations between the two countries. As the Sino-Soviet split deepened, the Soviet Union supported India by selling it military hardware. India turned to the Soviets for aid because the United States and the United Kingdom refused to sell advanced weaponry.

**Location**

China and India shared a long border. India claimed a 3,488-kilometer (2,167-mile) border, while China claimed a shorter one. Several disputed regions lie along this border. At the western end is Aksai Chin, roughly 38,000 square kilometers (15,000 square miles), which China claimed but India considered part of Ladakh. At the eastern end, China claimed the North East Frontier Agency (NESA), roughly 90,000 square kilometers (35,000 square miles), which India administered. The border ran through mountainous terrain at high elevations. Aksai Chin is a cold desert averaging 5,000 meters (16,000 feet) in altitude, while NESA consists of hilly terrain with peaks over 5,000 meters. The conflict took place in high-altitude, freezing conditions, creating serious logistical and welfare problems for both armies. The harsh environment also caused casualties, with many soldiers on both sides dying from the cold.

**Background**

The main cause of the war was a dispute over sovereignty of the widely separated Aksai Chin and NESA border regions. India claimed Aksai Chin as part of Ladakh; China claimed it as part of Xinjiang. China built a road through the region connecting Tibet and Xinjiang, which was one of the triggers of the conflict.

**Aksai Chin**

The western part of the Sino-Indian boundary traces back to 1834, when the armies of Raja Gulab Singh (a Dogra ruler under the Sikh Empire) conquered Ladakh. After an unsuccessful campaign into Tibet, Gulab Singh and the Tibetans signed a treaty in 1842 agreeing to stick to “old, established frontiers,” though these were not specified. The British defeated the Sikhs in 1846, taking control of Jammu and Kashmir, including Ladakh, and installed Gulab Singh as Maharaja under British suzerainty. British commissioners tried to negotiate the border with Chinese officials, but the Chinese showed no interest. The British commissioners fixed the southern end of the boundary at Pangong Lake but considered the area north of it up to the Karakoram Pass as terra incognita. The Maharaja of Kashmir and his officials were well aware of the trade routes from Ladakh. From Leh, two main routes led into Central Asia: one passed through the Karakoram Pass to Shahidulla at the foot of the Kunlun Mountains and then on to Yarkand via the Kilian and Sanju passes; the other went east through the Chang Chenmo Valley, crossed the Lingzi Tang Plains in Aksai Chin, and followed the Karakash River to join the first route at Shahidulla.