Ottoman Empire in World War I

Ottoman Empire in World War I
Name	Ottoman Empire in World War I
Caption	Ottoman fronts and territories, 1914–1918
Period	1914–1918
Combatants	Ottoman Empire; Allied Powers: British Empire, France, Russia, Italy, Greece, Serbia, Romania, Montenegro, Bulgaria; Central Powers: Germany, Austria-Hungary, Bulgaria
Commanders	Mehmed V, Enver Pasha, Talat Pasha, Jamal Pasha, Ahmed Djemal
Outcome	Defeat of Ottoman Empire; Armistice of Mudros; Treaty of Sèvres; Treaty of Lausanne

Ottoman Empire in World War I The Ottoman Empire entered World War I as a multiethnic empire centered in Istanbul that sought salvage and expansion amid European rivalries. Its alliance with the German Central Powers, far-reaching military campaigns from the Dardanelles to the Tigris and Euphrates and the Caucasus, and internal policies toward subject populations shaped both wartime strategy and postwar dissolution.

Background and entry into the war

In the decade before 1914 the Ottoman Empire faced territorial loss after the Italo-Turkish War and Balkan defeats at the First Balkan War and Second Balkan War, while the Committee of Union and Progress (CUP) leadership—notably Enver Pasha, Talat Pasha, and Ahmed Djemal—sought partners against encroaching British and Russian influence. The secretive naval and military ties with the German General Staff, the deployment of the German mission under Colmar von der Goltz, and the acquisition of the Battlecruiser SMS Goeben and Light cruiser SMS Breslau contributed to escalating alignment. The CUP signed the Ottoman–German alliance and later the Ottoman declaration of Jihad was influenced by the fall of Belgium and the naval bombardment of İzmir concerns, while diplomatic crises with France and Russia over the Bosporus and Dardanelles completed the entry.

Military campaigns and fronts

Ottoman forces engaged across multiple fronts: the Gallipoli Campaign pitted Ottoman commanders including Mustafa Kemal Atatürk against Royal Navy and ANZAC forces, while the Caucasus Campaign saw clashes with the Russian Empire culminating near Erzurum and Trabzon. In Mesopotamia campaign British forces advanced from Basra toward Baghdad, leading to the Siege of Kut and later capture of Baghdad. The Sinai and Palestine Campaign involved Ottoman defense against Egypt and Palestine invasions by British Empire and Indian Army units, encountering commanders such as Erich von Falkenhayn and Ferdinand von Sanders. Naval engagements occurred in the Black Sea and eastern Mediterranean, including actions near Yalta and the blockade centered on Istanbul. The Arab Revolt instigated by Hussein bin Ali, Sharif of Mecca and supported by British officers including T. E. Lawrence opened the Arabian theatre, while the Caucasus and Armenian fronts involved irregulars and the collapse of Russian authority after the February Revolution and October Revolution.

Political leadership and internal policies

The CUP-led triumvirate of Enver Pasha, Talat Pasha, and Ahmed Djemal centralized decision-making, pursuing Ottomanization and wartime requisitions influenced by wartime directives from the Ottoman General Staff. The sultan, Mehmed V, served as nominal head while real authority rested with the CUP and German advisors including Ludwig von Sanders. The government enacted emergency measures, martial law, and press censorship in Istanbul, conducted population transfers, and negotiated with the Central Powers about military support and economic credits from German Empire financiers. Internal politics were also affected by nationalist movements such as the Young Turks and the rise of figures like Mustafa Kemal Atatürk who later led the Turkish War of Independence.

Home front: economy, society, and wartime mobilization

Wartime mobilization requisitioned manpower and resources from provinces including Anatolia, Syria, Palestine, and Arabia, straining transport along the Hejaz Railway and the Baghdad Railway. Economic measures included war loans negotiated with German banks, food rationing in Istanbul and Aleppo, and price controls that aggravated urban unrest and strikes involving workers in Bursa and Adana. The empire organized labor and conscription quotas drawn from diverse populations including Kurds, Arabs, Armenians, Greeks of İzmir, and Jews of Thessaloniki, with disruptions to trade across the Mediterranean and Black Sea from blockades by Royal Navy and French Navy. Epidemics, transport collapse, and refugee flows altered demographic patterns across Rumelia and Greater Syria.

Ethnic minorities, deportations, and genocide

The CUP government's security concerns and wartime emergency measures led to mass population transfers and violent campaigns affecting Armenians, Assyrians, and Greeks of Anatolia. The Armenian population in eastern provinces such as Van, Bitlis, and Erzurum faced forced marches, massacres, and death marches under orders implemented by provincial authorities linked to central directives from Talat Pasha and Ahmed Djemal. Concurrently, large-scale deportations targeted Pontic Greeks in the Pontus region and Assyrian Christian communities in Hakkari and Syria; incidents at Seyfo and the destruction of villages resulted in high mortality. These events prompted international reactions from United States diplomats such as Henry Morgenthau Sr. and relief efforts by organizations like the American Committee for Armenian and Syrian Relief and the International Committee of the Red Cross.

Diplomatic relations and alliance with the Central Powers

Diplomacy centered on the Ottoman–German rapprochement, formalized by military agreements and the exchange of missions between Istanbul and Berlin. The alliance enabled German officers to command Ottoman forces and build infrastructure projects including the Baghdad Railway, while submarine warfare and commerce raiders affected Franco-British supply lines. The CUP navigated relations with Bulgaria after its entry into the war, negotiated armistice terms with Russia following the Treaty of Brest-Litovsk, and contended with American diplomatic pressure after United States entry into the war. Secret negotiations and postwar claims invoked the Sykes–Picot Agreement and conflicting promises to Arab leaders like Faisal I of Iraq and Hussein bin Ali.

Collapse, armistice, and postwar partitioning

Military setbacks, the 1917 revolutions in Russia, and Allied offensives culminated in Ottoman defeats and social breakdown; the Armistice of Mudros ended hostilities in October 1918 and placed Istanbul under Allied occupation. Postwar settlements such as the Treaty of Sèvres envisaged partitioning Ottoman territories among France, United Kingdom, Italy, and Greece, provoking nationalist resistance led by Mustafa Kemal Atatürk and the subsequent Turkish War of Independence. The eventual Treaty of Lausanne superseded Sèvres, recognizing the Republic of Turkey and redrawing borders while mandates under the League of Nations established British Mandate for Palestine and French Mandate for Syria and Lebanon, and Iraq and Transjordan emerged under British influence.

World War I