As a result, "Caio Duilio" only went on four patrols during the war, and was operational for a total of 70 hours. She was based at Taranto starting in November 1918 to April 1919, but during that time, she deployed to Corfu, from 10 November 1918 to 26 January 1919. On 26 April 1919, "Caio Duilio" was sent to Smyrna to help mediate a dispute over ownership of the area. While there, she had a confrontation with the Greek armored cruiser , but this was defused when the Greeks landed troops to occupy Smyrna. On 9 June, she was relieved by the old pre-dreadnought battleship , allowing her to move to Constantinople.