The first United Nations Emergency Force (UNEF) was established by United Nations General Assembly to secure an end to the Suez Crisis with resolution 1001 (ES-I) on November 7, 1956. The force was developed in large measure as a result of efforts by UN Secretary-General Dag Hammarskjöld and a Nobel Peace Prize-winning (1957) proposal and effort from Canadian Minister of External Affairs Lester B. Pearson. The General Assembly had approved a plan submitted by the Secretary-General which envisaged the deployment of UNEF on both sides of the armistice line. The Second United Nations Emergency Force (UNEF II) deployed from October 1973 to July 1979.