Franco-Prussian War

The Franco-Prussian War or Franco-German War, often referred to in France as the War of 1870, was a conflict between the Second French Empire and the North German Confederation led by the Kingdom of Prussia. Lasting from 19 July 1870 to 28 January 1871, the conflict was caused primarily by France's determination to reassert its dominant position in continental Europe, which appeared in question following the decisive Prussian victory over Austria in 1866.

After a prince of the Roman Catholic branch Hohenzollern-Sigmaringen had been offered the vacant Spanish throne in 1870 and had withdrawn his acceptance, the French ambassador approached Prussian King Wilhelm I at his vacationing site in Ems demanding Prussia renounce any future claims, which Wilhelm rejected. The internal Ems dispatch reported this to Berlin on July 13; Prussian chancellor Otto von Bismarck quickly then made it public with altered wording. Thus the French newspapers for July 14, the French national holiday contained translations of Bismarck's press release, but not a report from their own ambassador. A crowd in the streets of Paris demanded war, and soon French mobilization was ordered.

According to some historians, Prussian chancellor Otto von Bismarck deliberately provoked the French into declaring war on Prussia in order to induce four independent southern German states—Baden, Württemberg, Bavaria and Hesse-Darmstadt—to join the North German Confederation. Other historians contend that Bismarck exploited the circumstances as they unfolded. All agree that Bismarck recognized the potential for new German alliances, given the situation as a whole.

France mobilised its army on 15 July 1870, leading the North German Confederation to respond with its own mobilisation later that day. On 16 July 1870, the French parliament voted to declare war on Prussia; France invaded German territory on 2 August. The German coalition mobilised its troops much more effectively than the French and invaded northeastern France on 4 August. German forces were superior in numbers, training, and leadership and made more effective use of modern technology, particularly railways and artillery.

A series of hard-fought Prussian and German victories in eastern France, culminating in the Siege of Metz and the Battle of Sedan, resulted in the capture of the French Emperor Napoleon III and the decisive defeat of the army of the Second Empire; a Government of National Defense was formed in Paris on 4 September and continued the war for another five months. German forces fought and defeated new French armies in northern France, then besieged Paris for over four months before it fell on 28 January 1871, effectively ending the war.

In the final days of the war, with German victory all but assured, the German states proclaimed their union as the German Empire under the Prussian king Wilhelm I and Chancellor Bismarck. With the notable exceptions of Austria and German Switzerland, the vast majority of German-speakers were united under a nation-state for the first time. Following an armistice with France, the Treaty of Frankfurt was signed on 10 May 1871, giving Germany billions of francs in war indemnity, as well as most of Alsace and parts of Lorraine, which became the Imperial Territory of Alsace-Lorraine (Reichsland Elsaß-Lothringen).

The war had a lasting impact on Europe. By hastening German unification, the war significantly altered the balance of power on the continent, with the new German state supplanting France as the dominant European land power. Bismarck maintained great authority in international affairs for two decades, developing a reputation for Realpolitik that raised Germany's global stature and influence. In France, it brought a final end to imperial rule and began the first lasting republican government. Resentment over the French government's handling of the war and its aftermath triggered the Paris Commune, a revolutionary uprising which seized and held power for two months before its suppression; the event would influence the politics and policies of the Third Republic.

The causes of the Franco-Prussian War are rooted in the events surrounding the lead up to the unification of the German states under Otto von Bismarck. France had gained the status of being the dominant power of continental Europe as a result of the Franco-Austrian War of 1859. During the Austro-Prussian War of 1866, the Empress Eugénie, Foreign Minister Drouyn de Lhuys and War Minister Jacques Louis Randon were concerned that the power of Prussia might overtake that of France. They unsuccessfully urged Napoleon to mass troops at France's eastern borders while the bulk of the Prussian armies were still engaged in Bohemia as a warning that no territorial changes could be effected in Germany without consulting France.