In 1971, following a divisive election result, civil war broke out in the former East Pakistan (now Bangladesh) between the West Pakistani administrative authorities and the majority local population. India, to where many of East Pakistan's exiled political leaders and refugees from the fighting had fled, provided support for the dissidents including arming and training a Bangladeshi irregular force (the Mukti Bahini). To relieve pressure on their forces in the east, in December 1971 Pakistani forces launched a pre-emptive attack on India from the west, which was only partially successful and met with massive retaliation. Fighting on two fronts, Pakistan agreed to a ceasefire after the surrender of her forces in the east and territorial losses in the west (later ceded back to Pakistan following the 1972 Simla Agreement).