Any Chinese offensive is doomed to fail less they manage to replicate the 1962, 8:1 numerical strength(something they will never be able to do as India has now 6-7 divisions meant for China border in peacetime itself)
PLA’s war wherewithal on the Indo-Tibet frontline must be carted over 1500 kilometers from their logistic hubs at Lhasa and Kashgarh, which in turn must be stocked from central China, a further 2000 kilometers away. The entire logistic connectivity by road, rail, pipeline and air depends upon tenuous lines of communication and static staging yards, all situated over a terrain that is completely open, devoid of local resources and subject to such extreme conditions as it must obtain at 4300 meters of average altitude and sub-zero cold almost throughout the year. Even if China has engineered her transportation capacity to 24000 tons a day and therefore stated to be able to build up 30 divisions, including formations already in place, in 30 days, and sustain this force in war indefinitely, such theoretical calculations may be valid under ‘test conditions’, in practice this will invariably not be so. No doubt, the whole system of induction and sustenance for PLA’s field forces in war would be ripe for interdiction by air power and special operations.
On the Indian side, the terrain south of the 4300 to 5400 meter high Himalayan passes, constricted and snow-bound most of the year, is characterised by razor-sharp ridgelines, steep slopes and narrow, gorge-like valleys generally running North to South. The Indian logistic installations are between 350 to 400 kilometers in depth, and therefore, in terms of turn around time, comparable if not better to that of the PLA in Tibet. Road axes connecting Indian foothills to the Indo-Tibet Border, being aligned more or less along the narrow valley floors, are extremely difficult to interdict by air or ground fire; these are targetable only in some stretches and even then require super-skills, high-technology and load of chance to score effective hits. Notably, scope exists to make such hits even more ineffective by means of modern methods of camouflage, deception and repair.
To undertake offensive operations in such terrain, PLA formations have to confine to constricted valleys that are hemmed-in by successive ridge lines, thus limiting the scope for tactical level lateral manoeuvre. At the operational level, axes of offensive have to remain isolated from each other, while envelopment and turning movement, besides inviting risks of entrapment, would entail such heavy logistic back up as to be prohibitive in terms of resources and time. Further, some distance down the Southern slopes into Indian territory, the terrain closes down to subsume the advantages that heavy weaponry and high-technology might bring to PLA’s offensive. Indeed, the ground is heavily biased towards defensive operations - if conducted with aggressive intent.
We have reasons to believe that mother earth has not been overly supportive of aggression from Tibetan Plateau across the Himalayan Passes into India. Indeed, any PLA offensive across the Indo-Tibet Border has to contend with an adverse terrain anomaly: its build-up and spring-board areas straddle a ground that exposes its war machine to disruption by inhospitable elements as well as air and ground attack, while its offensive across the watershed passes would be beleaguered by a ground that favours classically conducted defensive operations. Indeed, PLA’s offensive across the passes would have to fight ‘friction of terrain’ and ‘tension of logistics’ before engaging Indian forces - with “General Snow” ever ready to cut off its lifeline.
Therefore, even if the PLA commits overwhelming number of formations to its offensives, as to how many of these could actually be employable - along limited, narrow axes, and against successive lines of defences, remains a moot point to consider.
I must say your wish of having the thoughts of besieging Delhi will be over in 2-3 hours
