@ By reading all the books available in Bangladesh (Many books of Pakistani generals are not available in Bangladesh) about our liberation war, I think, the Pakistan Army lost all hope specially all Muhajir officers of Pakistan Army and they broke even some Generals(Rao Ferman Ali) were making advance liaison with the American Embassy.
@ Pakistan Army's re-capturing of whole East Pakistan within a short spun of time was really a praise worthy and definitely the credit goes to General Niazi but unfortunately he was not treated fairly at his home.
@ During the whole operation Pakistan Army also had substantial number of public support among the Bengalees. But the problem was there was no political direction from the center. You see, the whole "Chakma Tribe" including their Raja Tridev Rai supported the Pakistan Army whole heartedly. Moreso, during that time the whole Mizo Brigade including Lal Denga was stationed at Rangamati. Infact, the Mukti Bahini could not do anything in Chittagong Hill Tracts during the whole nine months. After the surrender, the Indian "Kilo" force under command of General Oban immediadely rushed to Chittagong Hill Tract to netralise them.
@ Al-Badre, Al-Shams and Razakars also fought side by side with the Pakistani forces but the main problem was with the Pakistani Army that they hardly use to believe these Bengalee forces. I read in a book, once on 16 December 1971 once the Pakistani Army surrendered but yet the Al-Badre at Kishorganj did not accept the surrender they continue to fight with the Indian Army along with the Mukti Bahini kept it free for another 48 hours.
@ I have seen the liberation war, to tell you frankly, the Mukti Bahini hardly could harm the Pakistani Forces other than disrupting the line of communications and killing the pro-Pakistani politicians. Ofcource, it crippled the morale of Pakistani Forces to a great extend.
@ Finally, I think, there was something wrong about the surrender signal from GHQ. Yahya also said that he did not ordered or signed any signal for surrender rather he gave the final authority to Niazi to take action as per his discreation. Niazi said he received a direct surrender signal from GHQ signed by Yahya. I also hard from my relative who was at that time serving in GHQ, Rawalpindi that on 17 December 1971, there were lot of confusion regarding this in GHQ itself. The signal might have manipulated either by the Indian agents or by the higher echelon of Pakistan Army who were not interested to continue the war.