The Nathu La and Cho La clashes were a series of military clashes between India and China alongside the border of the Himalayan Kingdom of Sikkim, then an Indian protectorate.
The Nathu La clashes started on 11 September 1967, when the People's Liberation Army (PLA) launched an attack on Indian posts at Nathu La, and lasted till 15 September 1967. In October 1967, another military duel took place at Cho La and ended on the same day.
According to independent sources, India achieved "decisive tactical advantage" and managed to hold its own against Chinese forces. Many PLA fortifications at Nathu La were said to be destroyed, where the Indian troops drove back the attacking Chinese forces. The competition to control the disputed borderland in Chumbi valley is seen as a major cause for heightening the tensions in these incidents. Observers have commented that these clashes indicated the decline of 'claim strength' in China's decision to initiate the use of force against India, and stated that India was greatly pleased with the combat performance of its forces in the Nathu La clashes, seeing it as a sign of striking improvement since the 1962 Sino-Indian War.