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.
Enosis
Thessaly remained under Ottoman control after the formation of the Kingdom of Greece. Although parts of the territory had participated in the initial uprisings in the Greek War of Independence in 1821, the revolts had been swiftly crushed. During the Russo-Turkish War of 1877–78 Greece remained neutral, as a result of assurances by the Great Powers that her territorial claims on the Ottoman Empire would be considered after the war. In 1881 Greece and the Ottoman Empire signed the Convention of Constantinople which created a new Greco-Turkish border, incorporating most of Thessaly into Greece.