Battle of Mulhouse

The Hartmannswillerkopf, or Vieil Armand, was the theatre of fierce positional and attrition warfare throughout 1916. A strategic summit dominating the Alsace plain, it saw French and Germans clash in trench fighting, mining, raids, and incessant counter-attacks. Both sides sought to control this observation and artillery point, from which Mulhouse, Colmar, and the Belfort road could be watched. Offensives, bombardments, and sapper attacks succeeded one another for gains of a few metres, in snow or on muddy slopes. Despite immense sacrifices, neither side achieved decisive superiority. The Hartmannswillerkopf became a symbol of alpine martyrdom in the Great War, marked by ossuaries and vestiges still visible today.

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.

Fighting on the Linge ridge, begun in 1915, continued in 1916 through a series of localized engagements in an extremely difficult mountain environment. The Linge is a strategic ridge dominating the Munster valley. Throughout 1916, the French tried to retake the high points held by the Germans, who had heavily fortified the sector. Artillery exchanges, night raids, wave attacks, and constant counter-attacks produced only minimal gains. The front stabilized in vertical trench warfare, where every promontory or rock became a disputed bastion.