Canada’s role in the Second World War was far broader—and far deeper—than many realize. In this episode of The Deep Dive, we explore the nation’s military footprint across Europe, from the brutal street‑to‑street combat of Ortona to the hard‑won lessons of Dieppe and Juno Beach. We trace how Canadian factories mobilized through ingenious “bits and pieces” production, and how Canadian scientists quietly contributed to the Manhattan Project’s nuclear research. The episode examines the massive British Commonwealth Air Training Plan, a program that turned Canada into the world’s premier wartime flight school. But the records also reveal the country’s internal fractures, including the forced internment of Japanese Canadians and the political turmoil unleashed by the 1944 Conscription Crisis. We follow the war’s unexpected legacies, from the birth of a Dutch princess on Canadian soil to the long‑term environmental risks of munitions dumped at sea. Together, these stories paint a complex portrait of a nation at war— and the lasting imprint it left on Canada’s identity and the world.