The Indian Army, also called the British Indian Army, was involved in World War I as part of the British Empire. Almost 1.5 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.
The Meerut Cavalry Brigade was a cavalry brigade of the British Indian Army formed in 1904 as a result of the Kitchener Reforms. It was mobilized as 7th (Meerut) Cavalry Brigade at the outbreak of the First World War and departed for the Western Front where it served as part of the 2nd Indian Cavalry Division.
The 9th (Secunderabad) Division was an infantry division formation of the British Indian Army. It was part of the Southern Army and was formed in 1904 after Lord Kitchener was appointed Commander-in-Chief, India between 1902 and 1909. He instituted large-scale reforms, including merging the three armies of the Presidencies into a unified force and forming higher level formations, eight army divisions, and brigading Indian and British units. Following Kitchener's reforms, the British Indian Army became "the force recruited locally and permanently based in India, together with its expatriate British officers."
The Imperial Service Infantry Brigade was an infantry brigade of the British Indian Army that saw active service in the East African Campaign in the First World War.
Indian Army during World War I order of battle
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 Lucknow Cavalry Brigade was a cavalry brigade of the British Indian Army formed in 1911 as a result of the Kitchener Reforms. It was mobilized as 8th (Lucknow) Cavalry Brigade at the outbreak of the First World War as part of the 1st Indian Cavalry Division and departed for France. It served on the Western Front with the division until it was broken up in March 1918.
The 135th Infantry Brigade was an infantry brigade of the Territorial Force, part of the British Army. It was formed in the First World War as a duplicate of the South Western Brigade and was originally formed as the 2nd/1st South Western Brigade in 1914–1915 before later being renamed as the 135th Brigade. It was sent overseas to India in December 1914 to relieve Regular Army units for service in France. The brigade remained there for the rest of the war, supplying drafts of replacements to the British units fighting in the Middle East and later complete battalions.
The Ambala Cavalry Brigade was a cavalry brigade of the British Indian Army formed in 1904 as a result of the Kitchener Reforms. It was mobilized as 3rd (Ambala) Cavalry Brigade at the outbreak of the First World War as part of the 1st Indian Cavalry Division and departed for France. It served on the Western Front with the 1st and 2nd Indian Cavalry Divisions until it was broken up in March 1918.
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 Sialkot Cavalry Brigade was a cavalry brigade of the British Indian Army formed in 1904 as a result of the Kitchener Reforms. It was mobilized as 2nd (Sialkot) Cavalry Brigade at the outbreak of the First World War as part of the 1st Indian Cavalry Division and departed for France. It served on the Western Front with the division until it was broken up in March 1918.
The 6th Indian Cavalry Brigade was a cavalry brigade of the British Indian Army that saw active service in the Indian Army during the First World War. It took part in the Mesopotamian campaign and was broken up soon after the end of the war.
The Garhwal Brigade was an infantry brigade of the British Indian Army formed in 1902 as a result of the Kitchener Reforms. It was mobilized as 20th (Garhwal) Brigade at the outbreak of the First World War as part of the 7th (Meerut) Division and departed for France. It served on the Western Front until November 1915. It then moved to Egypt where it joined the 10th Indian Division, by now designated as 20th Indian Brigade. It left the division in March 1916 and thereafter served as an independent brigade in the Sinai and Palestine Campaign. It was broken up in 1920.
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.
The 43rd Indian 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 March 1917 as part of the 16th Indian Division for service on the North West Frontier. It remained in India throughout the First World War but saw active service in the Third Anglo-Afghan War. Post-war, it was designated as 21st Indian Infantry Brigade in September 1920 and took over responsibility for the Jubbulpore Brigade Area in 1923.
The Ferozepore 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 December 1914 as part of the 3rd Lahore Divisional Area for service on the North West Frontier and renamed as 44th (Ferozepore) Brigade in August 1915. It remained in India throughout the First World War but saw active service in the Third Anglo-Afghan War with the 16th Indian Division.
The 4th (Secunderabad) Cavalry Brigade was a cavalry brigade of the British Indian Army that formed part of the Indian Army during the First World War. It was formed as Secunderabad Cavalry Brigade in February 1915 to replace the original brigade that had been mobilized as the 9th (Secunderabad) Cavalry Brigade for service on the Western Front. It remained in India throughout the war.
The 7th Meerut Divisional Area was an infantry division of the British Indian Army that formed part of the Indian Army during the First World War. It was formed in September 1914 to replace the original 7th (Meerut) Division that had been mobilized in August 1914 for service on the Western Front. It was renamed as Meerut Division in June 1917 and remained in India throughout the war. The division was broken up in 1920.
The 6th Poona Divisional Area was an infantry division of the British Indian Army that formed part of the Indian Army during the First World War. It was formed in October 1914 to replace the original 6th (Poona) Division that had been mobilized in September 1914 for service in Mesopotamia. It was renamed as Poona Division in June 1917 and remained in India throughout the war. The division was redesignated as Poona District in 1920.
The 3rd Lahore Divisional Area was an infantry division of the British Indian Army that formed part of the Indian Army during the First World War. It was formed in September 1914 to replace the original 3rd (Lahore) Division that had been mobilized in August 1914 for service on the Western Front. It was abolished in May 1917 when its remaining responsibilities were passed on to the 16th Indian Division.
British India 
British Indian Army