G. A. Henty was born in Trumpington, near Cambridge. He was a sickly child who had to spend long periods in bed. During his frequent illnesses he became an avid reader and developed a wide range of interests which he carried into adulthood. He attended Westminster School, London, and later Gonville and Caius College, Cambridge, where he was a keen sportsman. He left the university early without completing his degree to volunteer for the Army Hospital Commissariat when the Crimean War began. He was sent to the Crimea and while there he witnessed the appalling conditions under which the British soldier had to fight.