The 43rd Erinpura Regiment was a regiment of the British Indian Army

British Indian Army

The British Indian Army, officially simply the Indian Army, was the principal army of the British Raj in India before the partition of India in 1947...

. They were raised in 1860, as the Erinpoorah Irregular Force by a Lt-Col J F W Hall and at that time consisted of both cavalry and infantry units. After the Kitchener reforms

Kitchener Reforms

The Kitchener Reforms of the Indian Army began in 1903 when Lord Kitchener of Khartoum, newly appointed Commander-in-Chief, India, completed the unification of the three armies of the former Presidencies , and also the Punjab Frontier Force, the Hyderabad Contingent and other local forces, into one...

 of the Indian Army in 1903, they became an infantry only regiment. During World War I

World War I

World War I , which was predominantly called the World War or the Great War from its occurrence until 1939, and the First World War or World War I thereafter, was a major war centred in Europe that began on 28 July 1914 and lasted until 11 November 1918...

 they served in the 15th Indian Division during the Mesopotamia Campaign. A second battalion was raised in 1917.

After World War I the Indian government reformed the army again moving from single battalion regiments to multi battalion regiment and also disbanding nine regiments. The 43rd Erinpura Regiment was one of the nine regiments disbanded in October 1921.