From 233,000 regulars in 1906 to 2.5 million volunteers in 1945, the largest volunteer army in history was recruited on a colonial idea — the “martial races.” Here is what that looked like in figures.
The British Indian Army grew from roughly 233,000 regulars in 1906 to 316,514 on the eve of the First World War, settled to a lean interwar establishment near 210,000, then exploded in the Second World War to a year-end peak of about 2.2 million in January 1945 — and close to 2.5 million across all services that summer, the largest all-volunteer force ever raised.
Through every one of those swings, two ratios held remarkably steady: roughly one British soldier to every two Indian, and a recruitment policy that favoured the same handful of communities and the same one province. This page follows the army along those constants.
From the 1880s to 1947, recruitment ran on the “martial races” doctrine — the colonial belief, hardened after the 1857 rebellion, that some Indian communities were inherently soldierly and others were not.
Favoured groups were Sikhs, Gurkhas, Rajputs and Punjabi Muslims; southern and eastern communities — Madrasis, Bengalis, Tamils — were reclassified as “non-martial” and recruited out of the line. The doctrine was never a neutral observation; it was a policy that shaped where regiments recruited and which men they would not take. Even at the 1918 Armistice, the historian Kaushik Roy notes, “the bulk of the Indian Army still came from the traditional martial races.” Everything that follows is downstream of this idea.
A note on language: throughout this page, “martial races” is named as the colonial authorities’ own doctrine — a policy attributed to its authors, never endorsed here.
No single fact shapes the army’s composition more than the rise of Punjab. Its share of the Indian army climbed from 44 percent in 1893 to 57 percent in 1904 to 62 percent by 1929.
In the First World War, Punjab alone furnished 40.7 percent of all recruits — 446,976 men, more than the next two provinces combined. At the war’s height the province was mobilising one man in twenty-eight, against one in a hundred and fifty across the rest of India. This concentration — “Punjabisation” — is the geographic signature of the martial-races policy.
The army logged its men by community-and-region labels — Punjabi Mussalman, Sikh, Gurkha, Dogra, Jat. A standing-army snapshot from around 1912 shows the shape: Sikhs at 20.5 percent, Punjabi Muslims at 16, Gurkhas at 11.5, with Muslims of all kinds about a third of the force.
Regiments were assembled like mosaics — fixed-proportion “class companies,” so a single battalion might be specified as four companies of Sikhs, two of Punjabi Muslims, two of Pathans.
There is no continuous, army-wide record of the religious or communal mix over time. The 1912 snapshot and the WWI recruitment tables are the two firmest data points; everything between them is benchmark, not series.
Between August 1914 and the end of 1919, India recruited 1,440,437 men — a mobilisation that did not just enlarge the army but reshaped its internal anatomy.
The arms kept small and British-light expanded fastest: Indian artillery rose roughly 400 percent, engineers 264, and the new Signal Service by some 2,000 percent, while infantry roughly tripled. Yet the recruiting base barely broadened — the new men came overwhelmingly from the same martial classes and the same Punjab districts, which is why the composition looks so similar before and after the largest expansion the army had ever seen.
Composition was not only a question of who served but of who could command. Indians were barred from the King’s Commission until 1918; thereafter the door opened by inches — ten Sandhurst places a year, a 25-percent target on paper, the eight-unit scheme of 1923, and finally the Indian Military Academy at Dehra Dun, opened in 1932.
The results were meagre: of 4,424 army officers on the eve of the Second World War, just 396 were Indian — fewer than one in ten. Wartime emergency commissioning then multiplied Indian officers more than twenty-fold, to 8,340 of 42,930 by September 1945. But seniority lagged far behind numbers: by early 1947, only nine Indians had reached lieutenant-colonel during the war.
The same wartime surge swept the two junior services off their tiny pre-war footings. The Royal Indian Navy grew nearly eighteen-fold — from 1,475 men in September 1939 to 27,651 by August 1945.
The Royal Indian Air Force began the war as a single squadron of 15 officers and 126 airmen and ended it with around 29,200 personnel across nine squadrons. Both Indianised their officer ranks faster, from a smaller base, than the army managed — the RIN commissioned nearly as many Indian as British officers during the war.
Victory was followed by the fastest contraction in the army’s history. Between October 1945 and mid-1947 the Indian Army fell from about 2.05 million to 587,422 — some 1.48 million Indian soldiers released, at roughly 74,000 a month, and 8,305 units disbanded.
The men recruited on a doctrine of martial fitness were demobilised on a schedule of imperial wind-down — and the force that remained was the one that would, within weeks, be divided.
At independence the army itself was partitioned. The split ran roughly two to one — about 260,000 men to India, 140,000 to Pakistan — apportioned regiment by regiment.
The ten Gurkha regiments were handled separately under a Tripartite Agreement: six to India, four to the British Army. The baseline Muslim-to-non-Muslim ratio of the undivided force had been about 30 to 70 — a legacy of exactly the recruitment geography this page has traced.
This is the section that earns the rest its trust. The army kept no continuous annual record of its own composition, so this page is built from periodic official returns, read against their limits — and it deliberately omits several familiar figures that do not survive scrutiny.
Every figure on this page traces to an official return or a named scholarly source; where the record is thin or secondary, we say so rather than smoothing it over.