Responding to the ultimatum issued on 16 December 1971 by the Indian Army in East, Lt-Gen. Niazi agreed to concede defeat and move towards signing the documented surrender with the Indian Army which effectively and unilaterally ended the armed resistance and led the creation of Bangladesh, only after India's official engagement that lasted 13 days. It was reported that the Eastern Command had surrendered ~93,000–97,000 uniform personnel to Indian Army– the largest surrender in a war by any country after the World War II. Casualties inflicted to army's I Corps, II Corps, and Marines did not sit well with President Yahya Khan who turned over control of the civic government to Zulfikar Ali Bhutto through an executive decree.