Excerpts from Books and Wikipedia
"Revolution was in the air. The French king had fled in February, and now it was the turn of the Italian states. Liberals were calling for political freedoms, and nationalists for independence from Austria. . . . It was all too good to last. Radetzky had withdrawn because he was needed at home, not because he was defeated. And in July he returned with reinforcements, winning a major victory at Custozza. Two lessons were apparent: that success required the involvement of the masses, not just the elites, and that a Great Power ally was needed to defeat Austria. The way was thus prepared for the successful unification of Italy in 1861." [Furtado: 1001 Days]