The 17th Indian Division was formed in 1917 from units of the British Indian Army for service in the Mesopotamia Campaign during World War I. After the war, it formed part of the occupation force for Iraq and took part in the Iraq Rebellion in 1920. In August 1923, the division was reduced to a single brigade.
The 14th Indian Division was formed during World War I, for service in the Mesopotamian Campaign. It was composed of battalions of the Regular British Army, the British Territorial Force and the British Indian Army.
The 1st (Risalpur) Cavalry Brigade was a cavalry brigade of the British Indian Army formed in 1906 as a result of the Kitchener Reforms. It remained in India during the First World War but took an active part in the Third Anglo-Afghan War in 1919.
The 34th Indian Brigade was an infantry brigade of the British Indian Army that saw active service in the Mesopotamian campaign in the Indian Army during the First World War. It was reformed for the Second World War as the 34th Indian States Forces Infantry Brigade.
The Secunderabad Cavalry Brigade was a cavalry brigade of the British Indian Army formed in 1907 as a result of the Kitchener Reforms. It was mobilized as 9th (Secunderabad) Cavalry Brigade at the outbreak of the First World War and departed for France. It served on the Western Front as part of the 1st and 2nd Indian Cavalry Divisions until it was broken up in March 1918.
The 52nd Indian Brigade was an infantry brigade of the British Indian Army that saw active service with the Indian Army during the First World War. It took part in the Mesopotamian campaign and formed part of the occupation force for Iraq post-war. It was not reformed for the Second World War.
The Ambala Brigade was an infantry brigade of the British Indian Army that formed part of the Indian Army during the First World War. It was formed in November 1914 to replace the original Ambala Brigade that had been mobilized as the 3rd (Ambala) Cavalry Brigade for service on the Western Front. It remained in India throughout the war.
The 51st Indian Brigade was an infantry brigade of the British Indian Army that saw active service with the Indian Army during the First World War. It took part in the Mesopotamian campaign and formed part of the occupation force for Iraq post-war.
The 12th Indian Brigade was an infantry brigade of the British Indian Army that saw active service in the First World War. It served in the Mesopotamian Campaign on the Euphrates Front throughout its existence.
The 55th Indian Brigade was an infantry brigade of the British Indian Army that saw active service with the Indian Army during the First World War. It took part in the Mesopotamian campaign and formed part of the occupation force for Iraq post-war.
The 54th Indian Brigade was an infantry brigade of the British Indian Army that saw active service with the Indian Army during the First World War. It took part in the Mesopotamian campaign and formed part of the occupation force for Iraq post-war. It was not reformed for the Second World War.
The 58th Indian Brigade was an infantry brigade of the British Indian Army that formed part of the Indian Army during the First World War. It remained in India throughout the war. It was not reformed for the Second World War.
The 59th Indian Brigade was an infantry brigade of the British Indian Army that formed part of the Indian Army during the First World War. It remained in India throughout the war. It was not reformed for the Second World War.
The 50th Indian Brigade was an infantry brigade of the British Indian Army that saw active service with the Indian Army during the First World War. It served in the Mesopotamian Campaign on the Euphrates Front throughout its existence. It was not reformed for the Second World War.
The 42nd Indian Brigade was an infantry brigade of the British Indian Army that saw active service with the Indian Army during the First World War. It served in the Mesopotamian Campaign on the Euphrates Front throughout its existence. It was not reformed for the Second World War.
The 41st Indian Brigade was an infantry brigade of the British Indian Army that saw service with the Indian Army during the First World War. It served in the Mesopotamian Campaign on the Euphrates Front throughout its existence. It was not reformed for the Second World War.
The 35th Indian Brigade was an infantry brigade of the British Indian Army that saw active service with the Indian Army during the First World War. It took part in the Mesopotamian campaign and was disbanded shortly after the end of the war. It was not reformed for the Second World War.
The 37th Indian Brigade was an infantry brigade of the British Indian Army that saw active service with the Indian Army during the First World War. It took part in the Mesopotamian campaign and was disbanded shortly after the end of the war.
The 36th Indian Brigade was an infantry brigade of the British Indian Army that saw active service with the Indian Army during the First World War. It took part in the Mesopotamian campaign and later formed part of the North Persia Force. It remained with the Force until withdrawn in June 1921.
The Lucknow Brigade was an infantry brigade of the British Indian Army formed in 1907 as a result of the Kitchener Reforms. It was mobilized as 22nd (Lucknow) Brigade at the outbreak of the First World War as part of Indian Expeditionary Force E. It served in Egypt in 1915 before being broken up in January 1916.
British India 
British Indian Army