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When was the French Croix de Guerre created?

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Curie, Marie and Pierre; medal — medal Pierre and Marie Curie depicted on the obverse of a medal from the Unio Internationalis Contra Cancrum (International Union Against Cancer) commemorating the Curies' discovery of radium in 1898.

The French Croix de Guerre (War Cross) was not created as a single entity at one time; rather, it was instituted in two separate years to recognize acts of bravery during the two World Wars. The decoration was first created in 1915 for World War I and was subsequently created again in 1939 for World War II.12

Additionally, a version known as the Croix de Guerre des Théâtres d’Opérations Extérieures ("War Cross of Foreign Theatres of Operation") was established in 1921 to honor forces serving in foreign lands.1