The Concert of Europe established in 1814 was shaken in 1859 when France and Austria fought over Italy. It came apart completely as a result of the wars of German Unification, when the Kingdom of Prussia, led by Chancellor Otto von Bismarck, defeated Austria in 1866 and France in 1870, replacing Austria-Hungary as the dominant power in Central Europe. Britain, diverted by the Irish question and adverse to warfare, chose not to intervene again to restore the European balance. Bismarck did not wish the breakup of the Ottoman Empire to create rivalries that might lead to war, so he took up the Tsar's earlier suggestion that arrangements be made in case the Ottoman Empire fell apart, creating the Three Emperors' League with Austria and Russia to keep France isolated on the continent.