 Pakistan launched pre-emptive air strikes on 11 Indian airbases on 3 December 1971, leading to India's entry into the war on the side of Bangladeshi nationalist forces.Untrained in guerrilla warfare, the Pakistani high command in the east collapsed under commanders General Amir Niazi and Admiral Muhammad Sharif.Exhausted, outflanked and overwhelmed, they could no longer continue the fight against the intense guerrilla insurgency, and finally surrendered to the Allied Forces of Bangladesh and India in Dhaka on 16December 1971.