Why did Dunkirk become called The Dunkirk Spirit?

The term "Dunkirk Spirit" emerged during World War II following the Dunkirk evacuation in May-June 1940, when Allied forces successfully rescued over 330,000 troops from the beaches of Dunkirk, France. This operation was seen as a miraculous escape in the face of overwhelming adversity, showcasing resilience, solidarity, and determination. The phrase encapsulates the British national character during wartime, symbolizing hope and collective effort in times of crisis. It has since been used to describe a spirit of camaraderie and perseverance in challenging situations.