This article explores the role of the Courrier Musical in the cultural mobilization of the French musical world during the Great War. It shows how, from 1916 to 1918, the journal played a crucial role in spreading a nationalist and anti-German propaganda. A comparison between this propaganda and articles published before and after the war then leads to qualify the idea that the war years were a singular and exceptional period in the history of discourses published in the Courrier musical. In fact, the war only brought to the foreground ideas and claims that had been regularly featured in the journal since the 1900s. Besides, Le Courrier musical also perpetuated these ideas and claims well after the official end of the Great War. Following recent historical studies on periods preceding and following the war, this article make a case for an understanding of the history of music during conflicts that does not restrict itself to the official dates of declarations of war and peace treatises.