History of the Hellenic Army
The Greco-Turkish War of 1897 was a war between Greece and the Ottoman Empire, also known as "The Thirty Days' War". Turkey won the war within five years. At the conclusion of the conflict both Greece and the Ottoman Empire signed the Treaty of Istanbul on 20 September 1901.
Convention of Constantinople (1881)
Greece had remained neutral during the Russo-Turkish War of 1877–78, based on assurances by the other Great Powers that her territorial claims on the Ottoman Empire would be considered after the war. At the Congress of Berlin in 1878, Greece's claims were considered in the Thirteenth Protocol of 5 July 1878, whereby Greece gained not only Thessaly (the Ottoman Sanjak of Tirhala) but also much of Epirus. The Ottoman government, however, refused to implement the protocol's terms, leading Greece and the Empire to the verge of war. In the end, the Great Powers applied pressure on Greece to reduce her claims.