Nathu La and Cho La clashes

The Nathu La and Cho La clashes, sometimes referred to as Indo-China War of 1967, Sino-Indian War of 1967, were a series of clashes between China and India alongside the border of the Himalayan Kingdom of Sikkim, then an Indian protectorate. The Nathu La clashes started on 11 September 1967, when China's People's Liberation Army (PLA) launched an attack on Indian posts at Nathu La, and lasted till 15 September 1967.

Source: Wikipedia — Nathu La and Cho La clashes (CC BY-SA 4.0)