150th Infantry

The 150th Infantry was an infantry regiment of the British Indian Army. It was formed in Mesopotamia in May 1918, saw service in the First World War and the Third Anglo-Afghan War, and was disbanded in June 1921.

Background
Heavy losses suffered by the British Expeditionary Force on the Western Front following the German spring offensive in March 1918 resulted in a major reorganization of the Egyptian Expeditionary Force: In fact, the 75th Division already had four Indian battalions assigned, so of the 36 battalions needed to reform the divisions, 22 were improvised by taking whole companies from existing units already on active service in Mesopotamia and Palestine to form the 150th Infantry (3 battalions), 151st Sikh Infantry (3), 152nd Punjabis (3), 153rd Punjabis (3), 154th Infantry (3), 155th Pioneers (2), 156th Infantry (1) and the 11th Gurkha Rifles (4). The donor units were then brought back up to strength by drafts. In the event, just 13 of the battalions were assigned to the divisions and the remaining nine were transferred from Mesopotamia to India in June 1918.
 * two divisions – 52nd (Lowland) and 74th (Yeomanry) –  were transferred to France in April; they were replaced by the 3rd (Lahore) and 7th (Meerut) Divisions from Mesopotamia;
 * nine yeomanry regiments were dismounted, converted to machine gunners and sent to France at the end of the same month; the 4th and 5th Cavalry Divisions were reformed with Indian cavalry regiments withdrawn from France and the 15th (Imperial Service) Cavalry Brigade already in Egypt;
 * the 10th (Irish), 53rd (Welsh), 60th (2/2nd London), and 75th Divisions were reduced to a single British battalion per brigade. They were reformed with nine Indian infantry battalions and an Indian pioneer battalion each.

Formation
The regiment formed three battalions in Mesopotamia in May 1918 with complete companies posted from regiments serving in the 15th, 17th, and 18th Indian Divisions. All three battalions were transferred to India in June 1918. The 2nd Battalion later took part in the Third Anglo-Afghan War in 1919 as part of the 16th Indian Division. They were disbanded in India in 1920 and 1921.

1st Battalion
The 1st Battalion was formed in Mesopotamia in May 1918 by the transfer of complete companies from: The battalion was transferred from Mesopotamia to India in June 1918 and joined the Ahmednagar Brigade in the 6th Poona Divisional Area where it remained in until the end of the First World War. The battalion was disbanded on 15 April 1921.
 * 2nd Queen Victoria's Own Rajput Light Infantry
 * 4th Prince Albert Victor's Rajputs
 * 8th Rajputs
 * 13th Rajputs (The Shekhawati Regiment)

2nd Battalion
The 2nd Battalion was formed in Mesopotamia in May 1918 by the transfer of complete companies from: The battalion was transferred from Mesopotamia to India in June 1918 and joined the Rawalpindi Additional Brigade in the 2nd (Rawalpindi) Division where it remained in until the end of the First World War. In May 1919, it mobilized with the 45th Indian Brigade, 16th Indian Division and took part in the Third Anglo-Afghan War. The battalion was disbanded on 15 June 1921.
 * 6th Jat Light Infantry
 * 9th Bhopal Infantry
 * 10th Jats
 * 104th Wellesley's Rifles

3rd Battalion
The 3rd Battalion was formed in Mesopotamia in May 1918 by the transfer of complete companies from: The battalion was transferred from Mesopotamia to India in June 1918 and joined the Ahmednagar Brigade in the 6th Poona Divisional Area where it remained in until the end of the First World War. The battalion was disbanded on 30 November 1920.
 * 42nd Deoli Regiment
 * 43rd Erinpura Regiment
 * 44th Merwara Infantry
 * 99th Deccan Infantry