Pls! there are many international sources. if you want, I will share with you! but still you will not accept, i know!
Example:
India Pushes China Back
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A scuffle broke out when Indian troops began laying barbed wire along what they recognized as the border. The scuffles soon escalated when a Chinese military unit began firing artillery shells at the Indians. In the ensuing conflict, more than 150 Indians and 340 Chinese were killed.
The clashes in September and October 1967 in those passes would later be considered the second all-out war between China and India.
But India prevailed, destroying Chinese fortifications in Nathu La and pushing them farther back into their territory near Cho La. The change in positions, however, meant that China and India each had different and conflicting ideas about the location of the Line of Actual Control.
The fighting was the last time that troops on either side would be killed — until the skirmishes in the Galwan Valley on Tuesday. Indian news outlets reported that Chinese soldiers had also been killed, but Beijing was tight-lipped.
Chinese troops in Tibet opened artillery fire across a Himalayan pass on Indian Army positions in Sikkim.
https://www.nytimes.com/2020/06/17/world/asia/india-china-border-clashes.html