No the NLI was not briefed on the nature and scope of the Ops that they were pushed into. Hear Lt Gen Shahid Aziz and Lt Gen Talat Masood's TV interview on this point. Actually the bearded PA Colonel who was then Deputy DG ISPR and who has also written a book based on interviews with serving (and surviving) personnel in Kargil is much more precise on this point. Btw, his observations as recorded in his book is at odds with what you are saying in some posts @
Armstrong; especially about morale in both the NLI ranks and among the dependants of the casualties.
About this Plan(?) of the gang of 4; it was so "ad hoc" that the PA patrols were asked to push forward and occupy what they could. Which they did, since they found vacated posts. That was the easy part. After that there was no plan. So they stayed put. Till the IA and IAF response began, That is when heel broke loose for the penn-packet deployments. When the resupply dump in Muntho Dhalo went up in smoke, then their survivabilty was gone, no food, no ammo, no hopes of even casevac. Not to forget that the winter push started in abt Nov 1998 had already taken its toll of medical casualties and all the PA units were well depleted.
Finally; it was not only the NLI that was involved in Kargil, though they were the bulk of the force.
There were others also:
Pakistani Forces used at Kargil
The forces earmarked for OPERATION BADR were: 3rd, 4th, 5th, 6th and 12th battalions of the Pakistan Army’s Northern Light Infantry (NLI). Also included were some Mujaheddin (employed as porters for resupply) and members of Pakistan's Special Services Group (SSG) since Officers from 1 and 3 Special Services Group were also killed. Along with elements from the Chitral and Bajaur Scouts. It is estimated that about 5,000 troops were involved, while the troops actually occupying the vacant Indian posts were approx. 1800.. Since officers from several other regiments were also identified – 24 Sind, 13 Azad Kashmir, 1 and 63 Frontier Force, 60 Baluch – it might be tempting to assume other battalions were involved. More likely that these officers probably were on deputation to the NLI.
These forces were provided with fire-support by at least 18 batteries of PA Artillery.
As that list above shows; it was not just the NLI or irregulars involved.