Franco-Prussian War: The Siege of Paris begins, which will result on January 28, 1871 in the surrender of Paris and a decisive Prussian victory.
The siege of Paris took place from 19 September 1870 to 28 January 1871 and ended in the capture of the city by forces of the various states of the North German Confederation, led by the Kingdom of Prussia. The siege was the culmination of the Franco-Prussian War, which saw the Second French Empire attempt to reassert its dominance over continental Europe by declaring war on the North German Confederation. The Prussian-dominated North German Confederation had recently emerged victorious in the Austro-Prussian War of 1866, which led to the questioning of Frances status as the dominant power of continental Europe. With a declaration of war by the French parliament on 16 July 1870, Imperial France soon faced a series of defeats at German hands over the following months, leading to the Battle of Sedan, which, on 2 September 1870, saw a decisive defeat of French forces and the capture of the French emperor, Napoleon III.
With the capture of Napoleon III, the government of the Second French Empire collapsed and the Third French Republic was declared, provisionally led by the Government of National Defense. Despite German forces reaching and besieging Paris by 19 September 1870, the new French government advocated for the continuation of the war, leading to over four more months of fighting, for which Paris found itself under siege for the duration. With the city fully encircled, the Parisian garrison attempted three unsuccessful break-out attempts and German forces began a relatively ineffectual artillery bombardment campaign of the city in January 1871. In response to the poor results of the artillery bombardment, the Prussians brought forth large-caliber Krupp heavy siege artillery to attack the city beginning 25 January 1871. With the renewed artillery attack and an increasingly starving and ill Parisian population and garrison, the Government of National Defense would conclude armistice negotiations with the North German Confederation on 28 January 1871. While the armistice led to food shipments being immediately permitted into the city, the capture of their capital city and the disaster of the war itself would have a long-lasting impact on the French populace, Franco-German relations, and Europe as a whole. French defeat in the war would directly lead to a victorious North German Confederation unifying with still-independent South German states and declaring the German Empire as well as a disgruntled and radicalized Parisian population taking control of Paris and forming the Paris Commune.
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. 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 swift Prussian and German victories in eastern France, culminating in the Siege of Metz and the Battle of Sedan, resulted in the French Emperor Napoleon III captured and the army of the Second Empire decisively defeated; 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 waning 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 exception of Austria, the vast majority of Germans were united under a nation-state for the first time in history. 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 the process of German unification, it significantly altered the balance of power on the continent; with the new German nation state supplanting France as the dominant European land power. Bismarck maintained great authority in international affairs for two decades, developing a reputation for adept and pragmatic diplomacy 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 France's defeat triggered a revolutionary uprising called the Paris Commune, which managed to seize and hold power for two months before its bloody suppression; the event would influence the politics and policies of the Third Republic.