Career
Educated at the Royal Military College, Sandhurst, Haythorne was commissioned into the 98th Regiment of Foot on 12 May 1837. He took part in the Battle of Chinkiang in July 1842 during the First Opium War. He was brigade major at the Battle of Balaclava in October 1854 and then commanded the 1st Battalion of the 1st Royals during the Siege of Sevastopol in Spring 1855 during the Crimean War.
He became Adjutant-General in India in June 1860 before retiring in January 1866.