Camillo di Cavour had negotiated a defensive alliance with Emperor Napoleon III of France. In the spring of 1859, Cavour provoked Vienna by massing Piedmontese troops near the border with Austrian Lombardy. The resulting Austrian declaration of war activated France’s obligations under the secret treaty. French troops rushed southwards across the Alps in the first major mobilization by railway. Between the end of April and the beginning of July, the joint French-Piedmontese forces occupied Lombardy, winning two major victories against the Austrians at Magenta (4 June) and Solferino (24 June). Piedmont annexed the Duchy of Lombardy; the duchies of Parma, Modena and Tuscany and the papal territory of Romagna were coaxed into a union with Turin. Piedmont now controlled the north of the peninsula and things might have stayed that way, had it not been for an invasion of the south by a band of volunteers under the command of Giuseppe Garibaldi. The Kingdom of Naples quickly collapsed, clearing the way for the unification of most of the peninsula under the rule of the Piedmontese monarchy. An Italian kingdom was proclaimed in March 1861.
The Prussian monarch, William I, and his foreign minister, Alexander von Schleinitz, responded to these events with the usual Prussian circumspection. As the Franco-Austrian conflict loomed, Prussia stuck to the middle ground, adopting neither the ‘conservative’ option of an alliance with Vienna, nor the ‘liberal’ option of a partnership with France against Austria. There were the usual efforts to make incremental gains in Germany at Austria’s expense. Berlin promised, for example, to assist Austria against France, but only on the condition that Prussia be placed in command of all the non-Austrian Confederal contingents. This proposal, which recalled the security initiatives of Bernstorff and Radowitz during the war scares of 1830–32 and 1840–41, was rejected on prestige grounds by the Austrian Emperor. At about the same time, Berlin deployed heavy troop concentrations to the Rhineland to deter Napoleon III from extending the sphere of his operations to western Germany. There was nothing particularly remarkable or unexpected about these measures. In responding thus to the Italian crisis (and the accompanying French war scare), the Prussian government worked within the well-worngrooves of a tentative dualist rivalry that sought to avoid direct confrontation while embracing the opportunity to expand Prussian influence at Austria’s expense.
Yet it is clear in retrospect that the Italian war set Prussian national policy on a new footing. It was obvious to contemporaries that there were parallels between the Italian and the German predicament. In both cases a strong sense (within the educated elite) of historical and cultural nationhood coexisted with the fact of dynastic and political division (though Italy had only seven separate states to Germany’s thirty-nine). In both cases, it was Austria that stood in the way of national consolidation. There were also clear parallels between Piedmont and Prussia. Both states were noted for their confident bureaucracies and their modernizing reforms, and both were constitutional monarchies (since 1848). Each had sought to suppress popular nationalism while at the same time manoeuvring to extend its own influence in the name of the nation over the lesser states within its sphere of interest. It was thus easy for small-German enthusiasts of a Prussian-led union to project the Italian events of 1859–61 on to the German political map. 2
The Italian war also demonstrated that new doors had opened within the European political system. Most important of these was the estrangement between Austria and Russia. In 1848, the Russians had saved the Austrian Empire from partition at the hands of the Hungarian national movement. During the Crimean War of 1854–6, however, the Austrians had made the fateful decision to join the anti-Russian coalition, a