Martial Race

Martial race was a designation created by Army officials of British India after the Indian Rebellion of 1857, where they classified each caste into one of two categories, 'martial' and 'non-martial'. The ostensible reason was that a 'martial race' was typically brave and well-built for fighting, while the 'non-martial races' were those whom the British believed to be unfit for battle because of their sedentary lifestyles. However, an alternative hypothesis is that British-trained Indian soldiers were among those who rebelled in 1857 and thereafter recruitment policy favoured castes which had remained loyal to the British and diminished or abandoned recruitment from the catchment area of the Bengal army. The concept already had a precedent in Indian culture as one of the four orders (varnas) in the Vedic social system of Hinduism is known as the Kshatriya, literally "warriors."

In their attempts to assert control in India, the British faced fierce resistance in some regions while easily conquering others. British officials sought 'martial races' accustomed to hunting, or from agricultural cultures from hilly or mountainous regions with a history of conflict. Others were excluded due to their 'ease of living' or branded as seditious agitators. The doctrine of 'martial races' postulated that the qualities that make a useful soldier are inherited and that most Indians, with the exception of the specified groups, did not have the requisite traits that would make them warriors.

The British recruited heavily from the 'martial races' for service in the colonial army. Sensing the inequalities and fierce loyalty to one's tribe or group of the diverse native peoples of the subcontinent, the British found opportunities to use it to their own great advantage. These already wide divides were a fertile breeding ground to inculcate pride in one's identity based on 'race'. This served the British in two ways. On the one hand it made sure that there was no repetition of the Indian rebellion of 1857 by ensuring there was no unity among the different subjects of the Raj. On the other hand, it encouraged a sense of competition among the different 'races'.

...
Wikipedia