The courageous Pakistan army stand on the eastern front —Sarmila Bose
"Clearly, the Pakistani army regained East Pakistan for their masters in Islamabad by April-May, creating an opportunity for a political settlement, and held off both Bengali guerrillas and their Indian supporters till November, buying more time — time and opportunity that Pakistan’s rulers and politicians failed to utilise."
https://pakteahouse.wordpress.com/2010/11/17/sarmila-bose-on-pak-army-in-east-pak-during-1971 war/
Authoritative scholarly analyses of 1971 are rare. The best work is Richard Sisson and Leo Rose’s War and Secession. Robert Jackson, fellow of All Soul’s College, Oxford, wrote an account shortly after the events. Most of the principal participants did not write about it, a notable exception being Gen. Niazi’s recent memoirs (1998). Some Indian officers have written books of uneven quality — they make for an embarrassing read for what the Indians have to say about one another.
However, a consistent picture emerges from the more objective accounts of the war. Sisson and Rose describe how India started assisting Bengali rebels since April, but “the Muktib Bahini had not been able to prevent the Pakistani army from regaining control over all the major urban centers on the East Pakistani-Indian border and even establishing a tenuous authority in most of the rural areas.” From July to October there was direct involvement of Indian military personnel. “…mid-October to 20 November… Indian artillery was used much more extensively in support …and Indian military forces, including tanks and air power on a few occasions, were also used…Indian units were withdrawn to Indian territory once their objectives had been brought under the control of the Mukti Bahini — though at times this was only for short periods, as, to the irritation of the Indians, the Mukti Bahini forces rarely held their ground when the Pakistani army launched a counterattack.”
Clearly, the Pakistani army regained East Pakistan for their masters in Islamabad by April-May, creating an opportunity for a political settlement, and held off both Bengali guerrillas and their Indian supporters till November, buying more time — time and opportunity that Pakistan’s rulers and politicians failed to utilise.
Contrary to Indian reports, full-scale war between India and Pakistan started in East Bengal on 21 November, making it a four-week war rather than a ‘lightning campaign’. Sisson and Rose state bluntly: “After the night of 21 November…Indian forces did not withdraw. From 21 to 25 November several Indian army divisions…launched simultaneous military actions on all of the key border regions of East Pakistan, and from all directions, with both armored and air support.” Indian officers like Sukhwant Singh and Lachhman Singh write quite openly in their books about India invading East Pakistani territory in November, which they knew was ‘an act of war’.
None of the outside scholars expected the Eastern garrison to withstand a full Indian invasion. On the contrary, Pakistan’s longstanding strategy was “the defense of the east is in the west”. Jackson writes, “Pakistani forces had largely withdrawn from scattered border-protection duties into cleverly fortified defensive positions at the major centres inside the frontiers, where they held all the major ‘place names’ against Mukti Bahini attacks, and blocked the routes of entry from India…”
Sisson and Rose point out the incongruity of Islamabad tolerating India’s invasion of East Pakistani territory in November. On 30 November Niazi received a message from General Hamid stating, “The whole nation is proud of you and you have their full support.” The same day Islamabad decided to launch an attack in the West on 2 December, later postponed to 3 December, after a two-week wait, but did not inform the Eastern command about it. According to Jackson, the Western offensive was frustrated by 10 December.