>There is no way for Chinese troops to invade India, separated by the highest mountain range in the world. Which rules out conventional war. India has tough soldiers in Gurkha’s, Marathi’s and Sikh’s. All totally fearless. Which means China can not win a mountain war.
China’s no slouch at mountain warfare as they demonstrated in Korea. The big limiting factor for China is their lack of a working logistic system.
Highest mountain in S.Korea is 7000’ while the Himalayan Mountains are at 25,000 to 29,000’. Not even in the same ball park.
What will determine the outcome is whose soldiers are more brave. During the last border skirmish, the Indian military was outgunned but fought to a stalemate because the soldiers stood their ground until killed.
Note that it was the Indian troops fighting with the British who were responsible for defeating the Japanese troops in Burma during WWII.
For your historical knowledge, It was Maratha warlord Shivaji who first defeated the much bigger military of Islamic emperor Aurangzeb which in turn stopped expansion of Islam in India. In hand to hand combat, usually the braver soldiers prevail.