Senyavin's blockade of their capital eventually drove the Turks to extremes. After food riots broke out, Sultan Selim III was replaced with Mustafa IV, who ordered his fleet to break the blockade. The Ottoman ships clashed with Senyavin's squadron in the Battle of the Dardanelles (May 11) and the Battle of Athos (June 16). Both engagements were Russian victories, and ensured Russia's ascendancy in the Aegean for the rest of the war.