Army Group North (French: Groupe d'armées du Nord, GAN) was a grouping of French field armies during the First World War, which was created on June 13, 1915, from French: Groupe Provisoire du Nord (GPN) which had been formed on October 4, 1914. On July 6, 1918, GAN was renamed Groupe d'armées du Centre (GAC).
The French Army and the First World War by Elizabeth Greenhalgh
Cartographie 1914 - 1918
Philippe Pétain et Marc Ferro (Avant-propos), La Guerre mondiale : 1914–1918, Toulouse, Éditions Privat, 2014, 372 p. (ISBN 978-2-708-96961-2, OCLC 891408727)
Les Armées Françaises dans la Grande Guerre. Tome X. Premier volume, p. 13 et s. Ministère de la Guerre 1923–1924