French First Army

French First Army. The French First Army was a major field army of the French Army, activated during both World War I and World War II. It played significant roles in critical campaigns on the Western Front and during the Liberation of France. The army was commanded by several notable French generals throughout its operational history.

History

The formation was first constituted in 1914 at the outbreak of World War I as part of the massive mobilization under Plan XVII. Initially positioned in the Grand Couronné region near Nancy, it was a key component of the French order of battle. After the war, the army was dissolved, only to be reconstituted in the lead-up to World War II as part of France's defensive preparations. Following the Battle of France and the Armistice of 22 June 1940, it was disbanded again before a final, powerful reformation in 1944 for the Allied advance from Paris to the Rhine.

World War I

During the Great Retreat in August 1914, the army fought in the Battle of the Frontiers and later participated in the First Battle of the Marne, helping to halt the German advance. Under commanders like Auguste Dubail and later Pierre Roques, it was engaged in the Battle of Lorraine and the Battle of the Somme in 1916. The army also saw extensive action during the Second Battle of the Aisne in 1917, part of the Nivelle Offensive, and endured significant casualties. In the final year of the war, it contributed to the Hundred Days Offensive, including the Battle of Saint-Mihiel and the Meuse-Argonne Offensive, operating alongside the American Expeditionary Forces.

World War II

Reformed in September 1939 under General Georges Blanchard, it was part of the First Army Group and initially deployed along the Belgian border. During the Battle of France in 1940, it was involved in the Dyle Plan and the subsequent fighting at Gembloux and Lille. Following the Dunkirk evacuation, remnants of the army fought in the Battle of the Alps against Italy before the French surrender. The army was famously reconstituted in 1944 as the French First Army (also known as Army B), commanded by General Jean de Lattre de Tassigny. It landed in Operation Dragoon in Southern France, liberated Toulon and Marseille, and fought north through the Rhône Valley. It distinguished itself in the Battle of the Colmar Pocket and later crossed the Rhine during Operation Undertone, eventually advancing into Germany and reaching the Danube by war's end.

Post-World War II

After Victory in Europe Day, the army formed part of the French occupation forces in Germany, headquartered in Baden-Baden within the French occupation zone. It was a principal component of the French Forces in Germany during the early Cold War period. The army was integrated into the military structures of the Western Union and later NATO, tasked with defending the Fulda Gap sector. It was officially disbanded in 1948, with its units and responsibilities absorbed into other commands as France reorganized its postwar military presence in Europe.

Commanders

Notable commanders included **World War I** leaders such as General Auguste Dubail (1914), General Pierre Roques (1915-1916), and General François Anthoine (1917). During **World War II**, it was led by General Georges Blanchard (1939-1940) and, most famously, General Jean de Lattre de Tassigny (1944-1945), who later became a Marshal of France. Other senior officers who commanded the army include General Antoine Béthouart and General Marie Émile Béthouart, who held interim command during the war.

Category:Field armies of France Category:Military units and formations established in 1914