In the years since the end of World War II, there have been many instances in which Canadian forces have been involved in peacekeeping missions. Peacekeeping has involved the use of nonbelligerent armed forces to keep belligerent armed forces apart. This is an idea is relatively new in the world. The belief is that separating the belligerent forces can lead to reduction in tensions and make a peaceful settlement more possible.
In the time since 1945, Canadian forces have been involved in many peacekeeping missions and other actions with similar missions. A list of all of them can be found at this link. Perhaps the best known of these episodes came in 1956. This was when a war broke out between Israel, France, and Britain on the one side and Egypt on the other over the Suez Canal. Canadian forces made up part of the United Nations force that was inserted to separate the belligerents as they withdrew and talked peace. This is an especially important incident in Canadian peacekeeping because the whole idea was introduced by Lester Pearson, who was at that time Canada’s Secretary of State for External Affairs.