In the 1950s the Suez Canal was a vital waterway linking Europe and Asia, and tensions between Britain-France and Egypt escalated. When Egypt nationalized the canal in 1956, Britain, France and Israel launched a military intervention, igniting what is known as the Suez Crisis (Second Arab-Israeli War). If the conflict had widened, the Cold War powers might have clashed directly, raising the specter of nuclear war. Canadian foreign minister Lester Pearson proposed a novel idea: send troops from neutral nations under the United Nations flag to monitor a cease-fire line. This United Nations Emergency Force (UNEF) entered the region from outside the belligerents’ territory and neutrally supervised disarmament and withdrawal. As a result, British and French forces withdrew and Egypt and Israel were deterred from renewed hostilities, giving the world a new model for peace maintenance. Pearson’s initiative is regarded as the prototype of modern Peacekeeping Operations (PKO) later used in Cambodia, East Timor and elsewhere. It also demonstrated to younger generations the importance of ‘multilateralism,’ solving disputes through diplomacy and international cooperation rather than force.

After World War II, a gray zone existed between Chapter VI and Chapter VII of the UN Charter, where non-enforcement peace maintenance measures were undefined. During the Suez Crisis, Egypt’s nationalization triggered Anglo-French-Israeli intervention, and Security Council action was paralyzed by British and French vetoes. Pearson exploited the General Assembly’s Emergency Special Session mechanism (Uniting for Peace Resolution 377A), bypassing the Council and creating UNEF by majority vote. The force consisted of non-belligerent troops from Canada, Brazil, India and Nordic states, with the chain of command reporting directly to the UN Secretary-General to ensure political neutrality. Contributing nations accepted Rules of Engagement limiting them to self-defense, a blueprint for today’s three PKO principles: 1) consent of the parties, 2) impartiality, and 3) non-use of force except in self-defense. Headquartered in Cairo, UNEF not only monitored military withdrawal but also assisted refugees and border demarcation, foreshadowing multifunctional missions. Although bypassing the Security Council was legally debated, it was widely regarded as a pragmatic compromise that preserved international legitimacy during the Cold War. Pearson’s plan concretely demonstrated the General Assembly’s supplementary role in collective security, making it a landmark case in the study of international institutions. UNEF’s cost-sharing scheme, based on scaled assessments of member states, became a prototype for later PKO financing mechanisms. Building on this success, Pearson advanced concepts linking peacekeeping with development aid, cementing Canada’s reputation as a ‘peacekeeping nation’.

For UNEF’s creation, Pearson invoked Rule 8(b) of the General Assembly’s Rules of Procedure, pushing an ad-hoc agenda item and securing a resolution within 24 hours. The mandate integrated inspection tasks with ‘peaceful separation,’ distinguishing UNEF from earlier observer missions like UNTSO as the first armed PKF. Canadian logistical support pioneered an offshore pre-positioning approach, noteworthy for maintaining supply lines while circumventing maritime blockades. The C2 structure adopted a three-tier model—Secretary-General → Force Commander → National Contingent Command—formally delineating political direction from operational control. The ROE, drafted with Ralph Bunche, contained mission-extension clauses for casualty evacuation and humanitarian corridors, prefiguring later multi-dimensional PKO doctrine. Financially, the mission was funded as an ‘on-top’ addition to the regular UN budget rather than a trust fund, sparking debate over the inverse relationship between assessment rates and troop contributions. Post-mission, the Canadian Department of External Affairs compiled after-action reports, supplying base data for the establishment of the UN Best Practices Unit on PKO. These institutional innovations influenced subsequent operations such as UNFICYP (1964) and the collective Nobel Peace Prize awarded to UN Peacekeepers in 1988.