France annexed the eastern part of County of Nice in 1860 (western part around Grasse already being annexed in 1792), during the Italian Wars of Independence. By an 1858 secret agreement concluded at Plombières between Napoleon III of France and Sardinian Prime Minister Count Camillo Benso di Cavour, France agreed to support Piedmont in a war against Austria in order to wrest the provinces of Lombardy and Venetia from Austrian rule. In exchange for French military assistance, Piedmont was to cede remaining part of the County of Nice and the Duchy of Savoy to France. The annexation was temporarily put in doubt after the Italian war of 1859, during which Napoleon III concluded a separate peace with Austria before Venetia could be captured.