Here is some more enlightenment from the Henderson-Brooks report:
Dhola Post that triggered war was on China's side of McMahon Line | Business Standard News
Basically, India set up military outposts far beyond the McMahon line, in land India does not even claim! Basically pure Chinese land. Then Nehru ordered the Indian Army to "throw the Chinese out" of that land, i.e. out of our own land.
Imagine Mexico set up military outposts in Texas, then told the Mexican Army to "throw the Americans" out of their own land. How ridiculous.
And please don't tell me you know more than your own Army, who compiled the Henderson-Brooks report in 1962.