sentences:  Both ships were pressed into action, initially to support Ottoman forces defending against the advance of Bulgarian troops in Thrace.In December, the fleet was reorganized to challenge the Greek Royal Hellenic Navy in the Aegean Sea; "Barbaros Hayreddin" was the flagship of the armored division.The division sortied to attack the Greek fleet in December, leading to the Battle of Elli, where the Greek armored cruiser used her superior speed to outmaneuver the Ottoman squadron, placing it in a cross-fire between "Georgios Averof" on one side and the three s on the other.