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feu de joie is a form of formal celebratory gunfire consisting of a celebratory rifle salute, described as a "running fire of guns." As soldiers fire into the air sequentially in rapid succession, the cascade of blank rounds produces a characteristic "rat-tat-tat" effect. It is used on rare landmark occasions of national rejoicing. During the 18th and 19th centuries, a feu de joie has celebrated a military victory or birthday. In recent years, it has marked, in Royal presence, the 80th Birthday and Diamond Jubilee of Queen Elizabeth II, as well as the Royal Air Force Centenary. Feux de joie also mark annual national or army days in, e.g., Canada, Malta, Nepal and Singapore.