Battle of Saint-Mihiel (June–July 1915 Offensive)

The 1915 Battle of Saint-Mihiel marked the first major French offensive to reduce the German salient threatening the Verdun–Bar-le-Duc line. For more than a month, French 2nd and 3rd armies launched a series of coordinated attacks, notably around villages of Les Éparges, Apremont, Bois-le-Prêtre, and the Calonne ridge. Despite intense artillery preparation and repeated assaults, German defenses, entrenched on wooded heights and concrete positions, held firm. French territorial gains were minimal, wrested at the cost of heavy losses in mine, trench, and booby-trapped wood combat. The offensive exhausted by mid-July without decisive strategic result.

Since September 1914, Germans held the Saint-Mihiel 'salient,' which threatened communications between Verdun and the rest of France. Reducing this pocket became a priority for Joffre, who entrusted the task to eastern armies. Terrain was particularly unfavorable: wooded hills, trench networks, ridges dominating the Woëvre plain. Germans had transformed every hill, every wood into a fortress, mining ground and installing defense in depth. The offensive aimed to reconquer the Éparges ridge, a key position for observation and control of the Meuse valley.

The attack began with massive heavy artillery bombardments, followed by infantry assaults on wooded slopes and barbed wire networks. French massively used mines and sappers for the first time to attempt blowing enemy positions. Combat around Les Éparges, Bois-le-Prêtre, and the Calonne trench became emblematic of attrition war: grenade attacks, mine warfare, constant bombardments, German counterattacks each night. Aviation was used for reconnaissance and fire correction, but weather and terrain limited progress.

The Saint-Mihiel offensive failed to reduce the German salient: a few ridges and woods were conquered, but the pocket remained in place until 1918. Losses were particularly high for derisory gains: Les Éparges, in particular, became a symbol of absurdity and horror of positional war. The battle inspired numerous literary testimonies (Maurice Genevoix, Louis Pergaud, etc.). For staff, the battle highlighted extreme difficulty of attacking fortified terrain and foreshadowed the hell of Verdun. Saint-Mihiel would remain until the 1918 American offensive a logistical and human nightmare for the French.