The Siege of Salerno was one of the campaigns of the Aghlabids in southern Italy during their conquest of Sicily. The Lombard city of Salerno had strong defences and, despite the use of stone-throwing artillery, the siege lasted a little over a year from its beginning in late 871 or early 872. Prince Guaifer of Salerno led the defence, but the siege was only lifted by the arrival of an army of Lombards and Franks under the Emperor Louis II.