Nehru's #AksaiChin Blunder! A must read. Both Indian & Chinese maps showed AksaiChin to be in India. In the 1950s Chinese built a road through Indian territory. Pt Nehru came to know but chose to keep quiet. Didnt confront China either. Historical blunders https://www.google.com/amp/s/m.rediff.com/amp/news/column/nehrus-aksai-chin-blunder/20170203.htm
India Today has accessed Ladakh Tehsil map of early 1909 and Chinese official maps of 1893 showing #Aksaichin & Galwan river valley, Depsang etc to be part of Ladakh, India. Yet India did not press territorial claims effectively. https://twitter.com/gauravcsawant/status/1266298759639527424?s=19
In 1960 Lt Gen SPP Thorat, then army commander eastern command after a year long assessment war gamed Chinese incursions. Exercise Lal Qila was conducted. Sadly professional military advice was ignored by VK Krishna Menon, then Raksha Mantri, I report https://www.indiatoday.in/india/north/story/lt-gen-thorat-1962-warning-on-chinese-intrusions-went-unheard-119084-2012-10-16
Chinese attack came exactly where Exercise Lal Qila war gamed. Both Krishna Menon (Nehru's favourite Raksha Mantri) & Lt Gen BM Kaul (Nehru appointed General) ignored professional military advise. Result was 1962 disaster. Nehru was shocked Menon didn't share Ex Lal Qila details.
But when professional military advice is taken India has given China "A Bloody Nose' like at #NathuLa in 1967. Barely 5 years after the 1962 setback & 2 years after 1965 war, Chinese tried to forcibly stop Indian army from erecting a fence at Nathu La. The Chinese MMG opened up.
Indian army troops not only silenced the MMG by hurling a grenade into the MMG bunker but the Indian artillery opened up with everything they had pin point targeting Chinese defences at Nathu La. By some accounts over 400 Chinese soldiers were killed & their 'white flag' came up.