Tibetan official chronicles and records mentioned nothing about Tang armies getting beaten by small Tibetan armies in Suzhou or that the Tibetan population is only 400,000. And we've already done a topic on Tibetan population and military potential; it was clearly more than just 400,000, even critically analyzing the census of later times. The Tibetan plateau could support more people than Mongolia, so 200,000 in universal mobilization is not at all impossible; whether its actually mobilized is another question.Two hundred thousand strong Tibetan armies only existed in the dreams of Tang historians. Tibetan folk history says that Tang got beaten by small Tibetan army in Suzhou. why should we believe Tang over Tibetan history ? And Tibet has 1/20th of arable land compared to the Xinjiang and the steppe pastures are much harsher than central asian steppes.. How the hell can they raise an army of 200000 strong ? The whole population of Tibet in 640 AD was around four hundred thousand strong. Did everybody from Tibetan grandfathers to the babies invade Tang dynasty ?
Tang got beaten multiple times by small Tibetan armies through out two hundred years of wars. Tang had ally with the Turks and the Arabs and even Indians to hold back the Tibetans ..let only defeat them.
Population of the Tibetan Empire