Late modern and contemporary On March 18, 1848, Milan efficaciously rebelled against Austrian rule, during the so-called "Five Days" (), that forced Field Marshal Radetzky to temporarily withdraw from the city. The bordering kingdom of Piedmont-Sardinia sent troops in order to protect the insurgents and organised a plebiscite that ratified by a huge majority the unification of Lombardy with Piedmont-Sardinia. But just a few months later the Austrians were able to send fresh forces that routed the Piedmontese army at the Battle of Custoza on 24 July and to reassert Austrian control over northern Italy. About ten years later, however, Italian nationalist politicians, officers and intellectuals such as Cavour, Garibaldi and Mazzini were able to gather a huge consensus and to pressure the monarchy to forge an alliance with the new French Empire of Napoleon III in order to defeat Austria and establish a large Italian state in the region. At the Battle of Solferino in 1859 French and Italian troops heavily defeated the Austrians that retreated under the Quadrilateral line. Following this battle, Milan and the rest of Lombardy were incorporated into Piedmont-Sardinia, which then proceeded to annex all the other Italian statlets and proclaim the birth of the Kingdom of Italy on March 17, 1861. The political unification of Italy enhanced Milan's economic dominance over northern Italy. A dense rail network, whose construction had started under Austrian patronage, was completed in a brief time, making Milan the rail hub of northern Italy and, with the opening of the Gotthard (1882) and Simplon (1906) railway tunnels, the major South European rail hub for goods and passenger transport. Indeed, Milan and Venice were among the main stops of the Orient Express that started operating from 1919. Abundant hydroelectric resources allowed the development of a strong steel and textile sector and, as Milanese banks dominated Italy's financial sphere, the city became the country's leading financial centre. Very rapid industrialization in the last two decades of the 1800s led to the birth of a massive worker class as well as bitter social conflicts. In May 1898, Milan was shaken by the Bava Beccaris massacre, a riot related to soaring cost of living. Milan's northern location in Italy closer to Europe, secured also a leading role for the city on the political scene. It was in Milan that Benito Mussolini built his political and journalistic careers, and his fascist Blackshirts rallied for the