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According to http://en.wikipedia.org/wiki/Indo-Pakistani_War_of_1971#Aftermath , India won the war overwhelmingly. What I also did not know was that they had taken territory in Pakistani provinces of Punjab, Sindh and Kashmir, only to return most of it (minus some key strategic areas).
An interesting point I read: "The accord also gave back more than 13,000 km² of land that Indian troops had seized in West Pakistan during the war, though India retained a few strategic areas.[102] But some in India felt that the treaty had been too lenient to Bhutto, who had pleaded for leniency, arguing that the fragile democracy in Pakistan would crumble if the accord was perceived as being overly harsh by Pakistanis and that he would be accused of losing Kashmir in addition to the loss of East Pakistan."
Anyone care to speculate the outcome of a harsher Simla agreement? A toppled Pakistan?