Rear-Admiral Donat Henchy O'Brien was a distinguished officer of the British Royal Navy whose career spanned the French Revolutionary and Napoleonic Wars. Born in March 1785, O'Brien was the son of a Royal Navy captain who claimed descent from an ancient Irish royal lineage. He entered naval service at a young age, serving as a midshipman during the French Revolutionary Wars and commanding a troop-carrying vessel during the Anglo-Russian invasion of Holland. He was later appointed acting lieutenant and served as a master's mate on the frigate Hussar.
In 1804, while returning to England, the Hussar was wrecked on the Île de Sein. O'Brien and his fellow crew members were captured by French forces. Imprisoned in France, O'Brien spent several years in captivity before staging a successful escape in 1808. He managed to travel across Europe to Trieste, where he successfully reached a British vessel. This dramatic escape and his experiences as a prisoner of war became the subject of an autobiographical book he authored later in life, contributing to the contemporary literature of naval memoirs.
Following his return to British service, O'Brien was promoted to lieutenant and served with the Mediterranean Fleet during the Napoleonic Wars, distinguishing himself in numerous boat actions that resulted in the capture of multiple enemy warships and cargo vessels. In 1818, he was posted to the South America Station, where he served during the early stages of the Argentine Civil Wars. He returned to England in 1821 and, though he never served at sea again, he was promoted to rear-admiral in the reserve in 1852. He died on May 13, 1857.
