High Quality Content by WIKIPEDIA articles! The Greco-Turkish War of 1897, also called the Thirty Days` War and known as the Black `97 in Greece, was a war fought between the Kingdom of Greece and Ottoman Empire. Its immediate cause was the question over the status of the Ottoman province of Crete, whose Greek majority long desired union with Greece. As a result of the intervention of the Great Powers after the war, an autonomous Cretan State under Ottoman suzerainty was established the following year, with Prince George of Greece as its first High Commissioner. This was the first war effort in which the military and political personnel of Greece were put to test after the war of independence in 1821.