The Sino-Indian War of 1967, also known as the Nathu La and Cho La incidents, (11 – 14 September 1967 for Nathu La; 1 – 10 October 1967 for Cho La) were a series of military clashes between India and China in the Himalayan Kingdom of Sikkim, then an Indian protectorate. The Chinese People’s Liberation Army infiltrated parts of Sikkim on 1 October 1967, but was repulsed by the Indian Army by 10 October. During the Cho La and Nathu La incidents, Indian losses were 88 killed in action and 163 wounded while Chinese casualties were estimated to be 340 killed in action and 450 wounded.
The end of the conflicts saw a Chinese military withdrawal from Sikkim after being defeated by Indian forces.
Sikkim became an Indian state in 1975 which was not recognised by China. In 2003, China recognised Sikkim as an Indian state on condition that India accept that the Tibet Autonomous Region was a part of China, even though India had already done so back in 1953. This mutual agreement led to a thaw in Sino-Indian relations.