This work investigates the intricacies and strategic objectives of English foreign policy during the mid-fifteenth century. Sir John Alexander Ferguson, drawing upon his background as a diplomat and historian, examines the complex interactions between the English crown and continental powers during the final stages of the Hundred Years' War. The text provides a rigorous analysis of the diplomatic machinery employed by the Lancastrian government to maintain influence in France and secure alliances across Europe.

Historians recognize this monograph as a specialized study of medieval statecraft and administrative history. Readers frequently note the academic density of the prose, which serves as a foundational reference for scholars focusing on the diplomatic history of the late Middle Ages.