This book investigates the historical reality of the British Army's political nature, challenging the long-standing assumption that the institution remains entirely neutral. Hew Strachan, a prominent military historian, utilizes extensive archival research and historical analysis from 1660 to the present to dismantle the facade of military apoliticism. He argues that the army is an inherently political entity, deeply embedded within the state's infrastructure and essential to the development and execution of national defense policy. Strachan contends that this political involvement is not a failure of the system, but a functional necessity for effective governance and military utility.

Experts recognize this work as a foundational text for understanding the complex civil-military relations within the British state. Readers frequently note the academic density of the prose and the author's rigorous approach to historical evidence.