Marshal William Carr Beresford is the story of a celebrated and distinguished Irishman who served as Commander in Chief of the Portuguese army for eleven years. The book follows the trajectory of Beresford's extensive military career. Born the illegitimate son of the 1st Marquis of Waterford, Beresford joined the British army in 1785, serving in the Mediterranean, Egypt, South Africa, and South America, before further distinguishing himself as Marshal of the Portuguese forces during the Peninsular War. Sent to Portugal to rebuild its army in the fight against Napoleon, Beresford was so successful that the Duke of Wellington integrated the Portuguese and British armed forces in that struggle. Beresford is revealed as a trusted friend and confidant of Wellington, a relationship that was to endure for the rest of their lives.