First World War – Battle of the Frontiers

The Battle of the Ardennes was one of the first major French offensives of the First World War, within the 'Battle of the Frontiers.' French armies pushed into the dense Ardennes forest to surprise the German right wing. Poorly coordinated, lacking effective reconnaissance, and blinded by fog, they encountered strongly entrenched German positions. Several days of extremely violent engagements followed, characterized by hand-to-hand combat in the woods, crossfire from artillery and machine guns, and massive losses on both sides. The battle ended in a crushing French defeat: the offensive collapsed and survivors had to withdraw toward the Meuse.

The Battle of Charleroi, also called the Battle of the Sambre, was one of the largest engagements of the war's opening. General Lanrezac's French 5th Army established itself on the Sambre near Charleroi with the mission of containing the German offensive and supporting the British left wing. Poorly prepared, French divisions immediately faced the shock of a massive German attack, preceded by uninterrupted artillery bombardment and multiple river crossings. Combat was of unheard-of intensity: villages taken and retaken, heroic barrages on Sambre bridges, massive engagement of German heavy artillery, and terrible street fighting at Charleroi, Gozée, Tamines, and Fosse. The coordinated German advance, supported by intact reserves, finally pierced French lines. Lanrezac's staff, overwhelmed, ordered retreat to avoid encirclement, leaving behind thousands of dead and prisoners.

The Battle of Lorraine was the largest French offensive of summer 1914, conducted on a front of nearly 80 km between Nancy and Sarrebourg. French armies advanced at forced march to reconquer Alsace-Lorraine, occupied several localities (Morhange, Château-Salins), and initially seemed to progress rapidly. But German resistance on fortified lines, then a powerful counteroffensive by Prince Rupprecht of Bavaria, inflicted a bloody defeat on the French army. French troops were forced into disorderly retreat to the gates of Nancy, suffering massive losses. This battle marked the strategic failure of Plan XVII and plunged France into defensive war on its own soil.