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Siege of Belfort
Part of the Franco-Prussian War
The Lion of Belfort monument by Frédéric Bartholdi
which commemorates the Siege of Belfort.
Date3 November 1870 - 18 February 1871
LocationBelfort, France
Result French victory; fortress abandoned following armistice
Flagge Großherzogtum Baden (1871-1891).svg Baden
Kingdom of Württemberg Württemberg
France France
Commanders and leaders
August von Werder
Udo von Tresckow
France Pierre Philippe Denfert-Rochereau
40 000 17 000
Casualties and losses
8,000 killed[citation needed]
256 guns
56 Officers
4,700 killed and wounded
336 civilian

The Siege of Belfort (3 November 1870 - 18 February 1871) was a 103-day military assault and blockade of the city of Belfort, France by Prussian forces during the Franco-Prussian War. The French garrison held out until the January 1871 armistice between France and the German Empire obligated French forces to abandon the stronghold in February 1871.

Belfort is located in a gap between the mountainous southern Vosges and the Jura Massif, strategically positioned as the gateway between Alsace and central France. At the beginning of the war, the French Army of the Rhine was routed in northern Alsace. The fall of Strasbourg on 28 September 1870 allowed the German army under August von Werder to move south against Belfort. Upon hearing of the approaching German army, Pierre Philippe Denfert-Rochereau, commander of Belfort, began constructing fortifications around the city, expanding those originally built by Vauban. Werder's forces reached Belfort and invested the city on 3 November. The intransigent resistance by the French forces stopped the Germans from completing an effective encirclement of the city. General Charles Denis Bourbaki assembled an army intending to relieve Belfort. On 15 January 1871 Bourbaki attacked Werder along the Lisaine River; however after a three-day battle he was repelled and his army retreated into Switzerland. German forces grew impatient with the length of the siege and on 27 January 1871, General von Tresckow launched an attack on the city which was repulsed and the siege operations resumed.

On 15 February an armistice was signed between France and Germany. Louis Adolphe Thiers, president of the Government of National Defense sent an urgent message to Denfert-Rochereau ordering him to surrender the fortress. On 18 February the Belfort garrison marched freely out of the city with their weapons and honor. During the 83 days of the heart of the siege the German army fired more than 400.000 shell on the town, or approximatively 5,000 per day.

In recognition of the French defense of Belfort, under the terms of the Treaty of Frankfurt, the city and its surrounding area were not handed over to Germany, unlike the remainder of Alsace.

See also


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