Belfort (. [bɛl.fɔʁ]) is a city in northeastern France in the Franche-Comte comté, region région Situated between Lyon. And strasbourg it is the biggest town and the administrative town Of the Territoire de belfort departement Département-In the. franche comte comté regionntil 1871, Belfort was part of the departement département Of-Haut, rhin In. Alsace The siege Of, belfort between 3 november 1870 and 18 february, 1871 was successfully resisted until the garrison was ordered to surrender 21 days after the armistice Between france And. prussia