Battle of Belfort

After more than three months of siege, German forces launched a series of assaults on Belfort in mid-February 1871 to force its surrender. The garrison, led by Denfert-Rochereau, resisted fiercely, inflicting heavy losses on the enemy. Despite exhaustion of supplies and ammunition, the city refused to capitulate. Only the announcement of the armistice signed on 28 January and the explicit request of the French government led Denfert-Rochereau to cease fire on 18 February.

Belfort was one of the last French bastions still resisting after the general collapse of the armies. Its strategic position in Alsace was crucial. The Germans hoped to occupy it to strengthen their position ahead of peace negotiations. The siege began in November 1870, but Denfert-Rochereau's stubborn resistance became a national symbol.

Defense relied on a series of forts encircling Belfort and on garrison discipline. Denfert-Rochereau organized targeted sorties to harass enemy lines. The Germans concentrated artillery and multiplied bombardments and assaults between 15 and 17 February. The garrison held firm despite extreme fatigue. Announcement of the armistice ended combat without surrender.

Belfort was the only fortress in Alsace that did not fall into German hands during the war. In recognition, France would obtain at the Treaty of Frankfurt that Belfort remain French while the rest of Alsace was annexed. Denfert-Rochereau became a national hero. The defense of Belfort symbolized courage and resilience in a context of general defeat.