Indian Expeditionary Force

Indian Army
Indian bicycle troops at the Battle of the Somme
Active	1857–1947
Country	India
Allegiance	British Empire
Type	Army
Size	1,780,000
Engagements	Second Boer War British expedition to Tibet World War I Waziristan campaign (1919–20) Waziristan campaign (1936–39) World War II
Commanders
Notable commanders	Herbert Kitchener, 1st Earl Kitchener William Slim, 1st Viscount Slim Archibald Wavell, 1st Earl Wavell Claude Auchinleck

The Indian Army during World War I contributed a large number of divisions and independent brigades to the European, Mediterranean and the Middle East theatres of war in World War I. Over one million Indian troops served overseas, of whom 62,000 died and another 67,000 were wounded. In total at least 74,187 Indian soldiers died during the war.

In World War I the Indian Army fought against the German Empire in German East Africa and on the Western Front. At the First Battle of Ypres, Khudadad Khan became the first Indian to be awarded a Victoria Cross. Indian divisions were also sent to Egypt, Gallipoli and nearly 700,000 served in Mesopotamia against the Ottoman Empire. While some divisions were sent overseas others had to remain in India guarding the North West Frontier and on internal security and training duties.

Field-Marshal Sir Claude Auchinleck, Commander-in-Chief of the Indian Army from 1942 asserted that the British "couldn't have come through both wars [World War I and II] if they hadn't had the Indian Army."

Herbert Kitchener was appointed Commander-in-Chief, India in 1902 and after five years, his term of office was extended by a further two—during which he reformed the Indian Army. The reforms now directed that there would be only one Indian Army, the three armies of the Presidencies being merged into a unified force. At the same time, the regiments of the Princely states were made available to be called out to become Imperial Service Troops. The British Army also continued to supply units for service in India, in addition to those of the Indian Army. The term Army of India was instituted to refer to the overall command structure which included both the British and Indian Army units. The new formation for the Army of India was set at nine divisions, each division with one cavalry and three infantry brigades and these nine divisions together with three independent infantry brigades would serve in India. The Indian Army was also responsible for supplying a division in Burma and a brigade in Aden.