The road leading to World War One began in 1870, which was the year of the Franco-Prussian War. This War led to the unification of a powerful and dynamic Germany, which threatened, to many great powers, as an unbalance of power in Europe. France was defeated, humiliated and isolated in this war, resulting in Germany obtaining French territory of Alsace-Lorraine. This alone already created tensions between France and Germany, as it was a bitter blow to the French. France was determined to acquire Alsace-Lorraine back (revanchism), and even created an offensive plan, the Plan XVII created by Joffre in 1913, which eventually never came to use due to it neither being financially nor militarily supported. France could not afford another war, yet were still irritated by this defeat, creating great tensions between Germany and France, which may have provoked the First World War.