On 18 March 1848, the Milanese rebelled against Austrian rule, during the so-called "Five Days" (), and Field Marshal Radetzky was forced to withdraw from the city temporarily. The Kingdom of Sardinia stepped in to help the insurgents; a plebiscite held in Lombardy decided in favour of unification with Sardinia. However, after defeating the Sardinian forces at Custoza on 24 July, Radetzky was able to reassert Austrian control over Milan and northern Italy. A few years on, however, Italian nationalists again called for the removal of Austria and Italian unification. Sardinia and France formed an alliance and defeated Austria at the Battle of Solferino in 1859. Following this battle, Milan and the rest of Lombardy were incorporated into the Kingdom of Sardinia, which soon gained control of most of Italy and in 1861 was rechristened as the Kingdom of Italy.