That simply does not make any sense
a single or some small tactical nuclear bombs subkiloton- 5kt yeild detonated inside our territory against the conventional forces of India that are invading our land
New delhi will not simply risk millions of civilian lives because of the destruction of an/some IBGs
I have said it earlier in my posts - the nuclear retaliation is inbuilt into the system and is free of poltical interference. The ultimate authority is with PM no doubt - but in case of a nuclear strike India may strike across the board with the intent to destroy existing strike/second strike capability of Pakistan/China.
Its got nothing to do with sacrifice of 5K or thereabouts (an IBG strength here). The pressure on the government of the day and military leadership will be too great in best of scenarios and additionally the perception does exist in India that Pakistan can not be trusted (albeit proved especially in Kargil issue) to act with genuine good intent/sanely. Post 1999 its been painfully stressed that due to this unpredictable nature India needs to assume the worst in every case. A single nuke deployment against troops who will at max be able to ingress 50 kms (this is because beyond that Indian army is not posturing) will cause India to assume readiness of PA to employ nukes any and every where .... so the issue comes to fore.
what if i told you Pakistan has enough Nuclear arsenal to destroy the infrastructure of India.
Transport, communications , public services
what if i told you 50 detonations of rather trivial 50kt yeild at 50 largest indian cities is all it takes?
you know what , Pakistan's arsenel Is larger than that.
And this is the least you should expect in a full scale nuclear exchange.
I would laugh - what infrastructure? I would be grateful for it if it can happen. Jokes apart - we will suffer ... but some part of country will be left - but even in one nuke deployment by you - retaliation will be across spectrum