Following the defeat of Austria, Napoleon resumed his search for allies against Prussia. In April 1867, he proposed an alliance, defensive and offensive, with Austria. If Austria joined France in a victorious war against Prussia, Napoleon promised that Austria could form a new confederation with the southern states of Germany and could annex Silesia, while France took for its part the left bank of the Rhine River. But the timing of Napoleon's offer was poorly chosen; Austria was in the process of a major internal reform, creating a new twin monarchy structure with two components, one being the Empire of Austria and the other being the Kingdom of Hungary.