A far more dangerous threat to Napoleon, however, was looming. France saw its dominance on the continent of Europe eroded by Prussia's crushing victory over Austria in the Austro-Prussian War in June–August 1866. To prevent Prussia under Chancellor Otto von Bismarck becoming even more powerful, Napoleon began the Franco-Prussian War. This war proved disastrous, and was instrumental in giving birth to the German Empire, which would take France's place as the major land power on the continent of Europe. In the 1870 Battle of Sedan Prussian forces captured the Emperor. The forces of the Third Republic deposed his government in Paris two days later.