First Balkan War: The Royal Hellenic Navy defeats the Ottoman Navy at the Battle of Elli.

The First Balkan War lasted from October 1912 to May 1913 and involved actions of the Balkan League against the Ottoman Empire. The Balkan states' combined armies overcame the initially numerically inferior and strategically disadvantaged Ottoman armies, achieving rapid success.

The Hellenic Navy is the naval force of Greece, part of the Hellenic Armed Forces. The modern Greek navy historically hails from the naval forces of various Aegean Islands, which fought in the Greek War of Independence. The Hellenic Navy formed during the Hellenic Period ruled by monarchy that has been recognized as the Royal Hellenic Navy.

The Ottoman Navy or the Imperial Navy, also known as the Ottoman Fleet, was the naval warfare arm of the Ottoman Empire. It was established after the Ottomans first reached the sea in 1323 by capturing Praenetos, the site of the first Ottoman naval shipyard and the nucleus of the future navy.

The Battle of Elli or the Battle of the Dardanelles took place near the mouth of the Dardanelles on 16 December [O.S. 3 December] 1912 as part of the First Balkan War between the fleets of the Kingdom of Greece and the Ottoman Empire. It was the largest sea battle of the Balkan Wars.