In 1824, after the conquest of Psara by the Turks, he commanded the Greek forces which prevented the further progress of the Sultan's fleet, though at the cost of the loss of many fire ships and men. But in the same year he was unable to prevent the Egyptian forces from occupying Navarino, though he harassed them with some success. In 1825 he succeeded in carrying stores and reinforcements into Missolonghi, when it was besieged for the third time, though he could not avert its fall. In order to save Missolonghi, he attempted to disrupt the sea communications of the Egyptian forces. In this he failed owing to the enormous disproportion of the two squadrons in the siege and strength of the ships.