Question

The maintenance of Army became easy in India for British due to

Answer 1

Introduction of railways in colonial period.

Due to the large amount of resources which is drained from India by British.

Answer 2

The maintenance of the army turned out to be an easy task for the British in India due to subsidiary alliance.

The policy of subsidiary alliance was declared by Lord Wellesley,  the British Governor-General in India who ruled between 1798 and 1805. 

Early, during his governorship, Wellesley approved a policy of non-intervention in the kingly states, but he later presumed the strategy of founding subsidiary alliances.