Over a five-month campaign, the German armies defeated the French army in a series of battles fought across northern France. Following a prolonged siege, the French capital Paris fell on January 28, 1871. The French admission of defeat, the Treaty of Frankfurt was signed May 10, 1871, during the time of the bloody Paris Commune of 1871. | Over a five-month campaign, the German armies defeated the French army in a series of battles fought across northern France. Following a prolonged siege, the French capital Paris fell on January 28, 1871. The French admission of defeat, the Treaty of Frankfurt was signed May 10, 1871, during the time of the bloody Paris Commune of 1871. |