The movement turned out to be a catastrophe for China as millions of people perished in violent purges weakening Mao's position as supreme leader of the ruling Communist Party of China (CPC) and he was sidelined.
"Naturally he (Mao) lost control of number of practical issues. So he wanted to testify and show he was still in power, especially of the military. So he called the commander in Tibet and asked Zhang are you confident you can win the war with India?" Wang said.
"The Commander said, 'Yes Mao, we can easily win the war'. Mao said 'go ahead and do that'. The purpose was to show that he was personally in control of the military. So it had little to do with territorial dispute, (may be) something to do with Tibet but not necessarily," according to Wang, who was also associated with the Institute of International Strategic Studies of Party School of the CPC.
Wang's version broadly supports excerpts from a book 'The Red Wall's Testimony', which were published in the official Chinese language media here sometime back.
"Everything China did in the border war with Soviet Union was triggered by domestic crisis in 1969" and so was 1979 war with Vietnam which was launched partly because Mao's successor Deng Xiaoping wanted to emerge as top leader, he said.
Asked whether he was convinced that domestic issues, more than territorial ambitions, prompted Mao to launch the war against India, Wang said "Yes yes I buy that theory because I looked at other episodes of history.
Asserting that China did not gain much out of the war, Wang said he was told by a top Chinese diplomat who served in India that the "war was totally unnecessary".