The Indian Army was one of the most important colonial institutions that the British created. From its humble origins as a mercantile police force to a modern contemporary army in the Second World War, this institution underwent many transitions. This book examines the Indian Army during the later colonial era from the First Afghan War in 1839 to Indian independence in 1947. During this period, the Indian Army developed from an internal policing force, to a frontier army, and then to a conventional western style fighting force capable of deployment to overseas’ theaters. These transitions resulted in significant structural and doctrinal changes in the army. The doctrines, and tactics honed during this period would have a dramatic impact upon the post-colonial armies of India and Pakistan. From civil-military relations to fighting and structural doctrines, the Indian and Pakistani armies closely reflect the deep-seated impact of decades of evolution during the late colonial era.