On March 25, the Pakistan Army launched a terror campaign calculated to intimidate the Bengalis into submission. Within hours a wholesale slaughter had commenced in Dhaka, with the heaviest attacks concentrated on the University of Dhaka and  the old town. Bengali remembers the date as a day of infamy and liberation. The Pakistan Army came with hit lists and systematically killed several hundred Bengalis. Mujib was captured and flown to West Pakistan for incarceration.

To conceal what they were doing, the Pakistan Army corralled the corps of foreign journalists at the International Hotel in Dhaka, seized their notes, and expelled them the next day. One reporter who escaped the censor net estimated that three battalions of troops--one armored, one artillery, and one infantry--had attacked the virtually defenseless city. Various informants, including missionaries and foreign journalists who clandestinely returned to East Pakistan during the war, estimated that by March 28 the loss of life reached 15,000. By the end of summer as many as 30,00,000 people killed by Pakistani army.

The West Pakistani press waged a vigorous but ultimately futile campaign to counteract newspaper and radio accounts of wholesale atrocities. One paper, the Morning News, even editorialized that the armed forces were saving East Pakistanis from eventual Hindu enslavement. The civil war was played down by the government-controlled press as a minor insurrection quickly being brought under control.

After the tragic events of March, India became vocal in its condemnation of Pakistan. An immense flood of East Pakistani refugees, between 8 and 10 million according to various estimates, fled across the border into the Indian state of West Bengal. In April an Indian parliamentary resolution demanded that Prime Minister Indira Gandhi supply aid to the rebels in East Pakistan. She complied but declined to recognize the provisional government of independent Bangladesh.

A propaganda war between Pakistan and India ensued in which Yahya threatened war against India if that country made an attempt to seize any part of Pakistan. Yahya also asserted that Pakistan could count on its American and Chinese friends. At the same time, Pakistan tried to ease the situation in the East Wing. Belatedly, it replaced Tikka, whose military tactics had caused such havoc and human loss of life, with the more restrained Lieutenant General A.A.K. Niazi. A moderate Bengali, Abdul Malik, was installed as the civilian governor of East Pakistan. These belated gestures of appeasement did not yield results or change world opinion.

On December 4, 1971, the Indian Army, far superior in numbers and equipment to that of Pakistan, executed a 3-pronged pincer movement on Dhaka launched from the Indian states of West Bengal, Assam, and Tripura, taking only 12 days to defeat the 90,000 Pakistani defenders. The Pakistan Army was weakened by having to operate so far away from its source of supply. The Indian Army, on the other hand, was aided by East Pakistan's Mukti Bahini (Liberation Force), the freedom fighters who managed to keep the Pakistan Army at bay in many areas.