Article: When the war had begun, European public opinion heavily favored the Germans; many Italians attempted to sign up as volunteers at the Prussian embassy in Florence and a Prussian diplomat visited Giuseppe Garibaldi in Caprera. Bismarck's demand for the return of Alsace caused a dramatic shift in that sentiment in Italy, which was best exemplified by the reaction of Garibaldi soon after the revolution in Paris, who told the Movimento of Genoa on 7 September 1870 that "Yesterday I said to you: war to the death to Bonaparte. Today I say to you: rescue the French Republic by every means." Garibaldi went to France and assumed command of the Army of the Vosges, with which he operated around Dijon till the end of the war.

Question: What caused a dramatic shift in Italian sentiment toward the war?
Bismarck's demand for the return of Alsace