The ISI was set up in 1948, shortly after the first war with India, to strengthen sharing of intelligence between the army, navy and air force. It was headed first by Maj Gen R. Cawthorne, one of the last British officers to leave Pakistan. He continued at the helm of ISI till 1956. Thereafter, for almost three years, it remained headless as Pakistan faced constitutional turmoil leading finally to Ayub Khan’s first martial law take-over. Ayub appointed Brig Riaz Hussain as ISI chief and he continued up to 1966.