the terrain is made of highs and lows and particularly in chumar, indian position is on the higher ground.
btw, as one news said,
So the government is considering moving the Assam Rifles from the eastern borders and adding its 40 battalions -- roughly 40,000 troops --to the defence of the LAC. Currently there are about 105,000 soldiers guarding the LAC, of whom 15,000 are in the eastern Ladakh sector.
india has numerical advantage, india has unending supply of troops, the govt's decision not to curb births of male children has given this advantage whereas in china, the supply of troops will be limited for many reasons which you know. india can hire men to fight china on the basis of less than $ 80 per month salary, many are unemployed and hungry, they will be ready to go to the front for that much amount of money. china can't do that, they have limited supply of human resources.