Meanwhile, in Lombardy, tensions increased until the Milanese and Venetians rose in revolt on 18 March 1848. The insurrection in Milan succeeded in expelling the Austrian garrison after five days of street fights – 18–22 March (Cinque giornate di Milano). An Austrian army under Marshal Josef Radetzky besieged Milan, but due to defection of many of his troops and the support of the Milanese for the revolt, they were forced to retreat.