1860 Annexation of Savoy to France in August by Edourard Riou (Versailles) Photo credit Gérard Blot
A crowd is out celebrating the annexation of Savoy by France in this 1860 print.
I do not know what "annexation" actually meant - alliance? A French takeover of Savoy? Savoy somehow remained independent of France and annexed the rest of Italy to unify it; the departure of Napoleon III finished Cavour's plans because the Papal States lost their protector and collapsed down to today's Vatican City.
Photo credit - Gérard Blot.