During World War I, there were two 8th armies. The first was in existence under the command of General Victor d'Urbal until April 1915 when 9th Army Corps and 20th Army Corps were joined to 10th Army, which d'Urbal assumed command of for the Second Battle of Artois. The remainder of 8th Army was then renamed as the Détachement d'armée de Belgique.[1]
The 8th Army was reformed from the former Détachement d'armée de Lorraine (Army Detachment of Lorraine) and operated on the Western Front between 2 January 1917 and 11 November 1918. After the armistice at the end of World War I, it was part of the occupation of the Rhineland. On 21 October 1919 it was combined with the Tenth Army to form the French Army of the Rhine.
At the start of the German offensive, the Eighth Army, commanded by General Marcel Garchery, was organized as follows:
Army Assets (Organiques d'Armée)
Army Assets & Reserve (Click "show" to expand)
Pioneer Regiments: 408th, 418th, 428th, and 443rd Pioneer Regiments (Régiment de Pionniers - RP) [2]
Tank Units: 18th and 36th Light Tank Battalions (Bataillon de Chars de Combat - BCC) [Renault R35]; 16th and 17th Reserve Tank Battalions (Bataillon de Chars de Combat de Réserve - BCCR) [2]
Army Heavy Artillery: 116th Heavy Artillery Regiment (116e Régiment d'Artillerie Lourde Hippomobile - RALH); 197th Heavy Artillery Regiment (197e Régiment d'Artillerie Lourde à Tracteurs - RALT); 316th Position Artillery Regiment (316e Régiment d'Artillerie de Position - RAP) [2]
13th Army Corps (13e Corps d'Armée)
13th Army Corps (Click "show" to expand)
Corps Assets: 23rd Reconnaissance Group of the Army Corps (23e Groupe de Reconnaissance de Corps d'Armée - GRCA) [2]
^ abcdefghijklmnopService Historique de l'Armée de Terre (1967). Les Grandes Unités Françaises de la Guerre 1939-1945, Historiques Succincts. Vincennes: SHAT.