The Ottomans recovered, and retaliated in turn with savagery, massacring the Greek population of Chios and other towns. This worked to their disadvantage by provoking further sympathy for the Greeks in Britain and France. The Greeks were unable to establish a strong government in the areas they controlled, and fell to fighting amongst themselves. Inconclusive fighting between Greeks and Ottomans continued until 1825 when the Sultan sent a powerful fleet and army who were mainly Bedouin and some Sudanese from Egypt under Ibrahim Pasha to suppress the revolution, promising to him the rule of Peloponnese, however they were eventually defeated in the Battle of Navarino in 1827.