The French forces left behind became unpopular with the Maltese, due particularly to the French forces' hostility towards Catholicism and pillaging of local churches to fund Napoleon's war efforts. French financial and religious policies so angered the Maltese that they rebelled, forcing the French to depart. Great Britain, along with the Kingdom of Naples and the Kingdom of Sicily, sent ammunition and aid to the Maltese, and Britain also sent its navy, which blockaded the islands.