But with the Italian Risorgimento Rome experienced a third "rebirth". On September 20 1870, Garibaldi's army, which had the task of uniting all of Italy under the crown of Savoy, entered the city through a breach opened in the walls at Porta Pia and, the same year, Rome became the capital of the new Italian state. In a few decades Rome grew to be one of the most important capitals of Europe and of the world: in 1936 it was the capital of the "Italian Empire", even if for a few years because of the second world war.