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| British Mesopotamian Expeditionary Force | |
|---|---|
| Name | Mesopotamian Expeditionary Force |
| Active | 1914–1918 |
| Country | United Kingdom |
| Branch | British Army |
| Type | Expeditionary force |
| Role | Campaign operations in Mesopotamia |
| Battles | Siege of Kut, Fall of Basra, Capture of Baghdad |
British Mesopotamian Expeditionary Force
The Mesopotamian Expeditionary Force deployed British Indian Army and British Army units to the Mesopotamian campaign in the First World War, aiming to secure oil facilities near Persian Gulf ports and protect lines to India. It operated across theatre-level engagements including the Siege of Kut, the Capture of Baghdad (1917), and linked to Ottoman fronts such as the Sinai and Palestine Campaign and the Caucasus Campaign. Political directives from Winston Churchill and logistical constraints involving Royal Navy co-operation shaped operations alongside colonial authorities including the Viceroy of India.
The force was raised following strategic concerns about the Anglo-Persian Oil Company installations at Abadan and the vulnerability of the Persian Gulf to the Ottoman Empire after Ottoman entry into the First World War. Early planning involved coordination between the Admiralty, the War Office, and the India Office, influenced by figures such as Sirr John Glubb's predecessors and by intelligence from British Indian Army staffs. Initial landings at Fao and the occupation of Basra reflected directives tied to imperial defense of Bombay and the Mesopotamian littoral. The establishment drew on formations returned from the Second Boer War and units experienced in the North West Frontier.
The Expeditionary Force combined corps- and division-level formations from the Indian Corps (First World War), including regular divisions such as the 6th (Poona) Division and later forces like the 13th (Western) Division and the 15th Indian Division. Cavalry elements included regiments connected to the Lucknow Cavalry Brigade and yeomanry formerly linked with the Imperial Yeomanry. Artillery support was provided by batteries of the Royal Horse Artillery and the Royal Garrison Artillery, while engineering tasks fell to units of the Royal Engineers. Aviation support featured squadrons from the Royal Flying Corps and later the Royal Air Force. Command and staff appointments were drawn from the Indian Staff Corps and the British General Staff.
Operations began with the Battle of Basra (1914) and advanced to actions at Qurna and Shaiba. The advance up the Tigris led to the protracted Siege of Kut (1915–1916), culminating in surrender to forces led by Halil Pasha and resulting in strategic reassessment by commanders such as General Sir John Nixon and General Sir Charles Townshend. Renewed offensives under leaders including Sir Frederick Stanley Maude achieved the Capture of Baghdad (1917), linking to operations around Tikrit and the Diyala. The force later coordinated with allied elements in campaigns tied to the Treaty of Sèvres context and the dissolution of Ottoman control, intersecting with actions involving Sharif Hussein and the Arab Revolt.
Supply lines ran from Basra upriver on the Shatt al-Arab and the Tigris, relying on river flotillas of the Royal Navy and supply convoys from Bombay and Basra Port. Difficulties included seasonal flooding, heat stress, and terrain familiar to Royal Army Medical Corps and Indian medical services such as the Indian Medical Service. Disease, including malaria and dysentery, alongside shortages of ammunition and winter clothing, stressed units and prompted reforms in transport using river steamers, lighters, and redeployments of the Royal Army Service Corps. Veterinary care for cavalry and transport animals involved the Army Veterinary Corps.
Key commanders included theatre leaders such as General Sir John Nixon, General Sir Charles Townshend, and Sir Frederick Stanley Maude. Senior staff officers and brigade commanders came from backgrounds in the Indian Army like Major-General Sir George Younghusband and British regulars with service in theatres such as the Western Front and the Gulf. Notable subordinate figures included engineers and medical officers attached from the Royal Engineers and the Royal Army Medical Corps, as well as aviators from the Royal Flying Corps such as squadron leaders who later served in the Royal Air Force.
The force engaged with Ottoman-administered provinces, interacting with ethnic and religious communities including Arab sheikhs, Kurdish tribes, and the Assyrian and Chaldean minorities. British political agents worked alongside the India Office and regional governors to negotiate with local leaders such as notable sheikhs in Al-Qurnah and merchants in Basra. Relations intersected with larger political movements like the Arab Revolt and the activities of the Ottoman Special Organization, influencing British policy towards postwar settlement including input to the League of Nations mandate discussions.
Following armistice terms impacting the Ottoman Empire and the signing dynamics leading to the Treaty of Sèvres, the Expeditionary Force wound down as units returned to India, Britain, and other postings, and as occupation structures evolved into civil administrations that later informed the Mandatory Iraq arrangement. Legacy issues included lessons adopted by the British Army on expeditionary logistics, impacts on colonial military policy debated in the House of Commons and the India Office, and commemorations in regimental histories tied to the Imperial War Museum and memorials in Basra and Kut. Disbandment formally completed as units were reassigned or demobilized during the postwar reductions influenced by the Ten-Year Rule and interwar defence reviews.
Category:Military units and formations of the United Kingdom Category:Mesopotamian campaign