This work investigates the historical development, cultural ethos, and eventual decline of the Indian Army under British colonial rule. Philip Mason, a former member of the Indian Civil Service, utilizes his extensive administrative experience and archival research to construct a comprehensive account of the institution. He argues that the army functioned as a distinct social and political entity, shaped by the complex interplay between British military traditions and the diverse traditions of the Indian subcontinent.

Historians and military scholars frequently cite this work as a foundational text for understanding the administrative and social history of the British Raj. Readers often note the narrative clarity of the prose, which balances academic rigor with accessible historical storytelling.