Major General Douglas Edward Cayley, CB, CMG, late the Worcestershire Regiment. He was the son of Deputy Surgeon General Henry Cayley, CMG, Indian Medical Service, and Letitia Mary Cayley. Baptised on 17 Aug 1870 in Simla, Bengal, India. Educated at Clifton College and the Royal Military College, Sandhurst. Commissioned into the Worcestershire Regiment as a second lieutenant on 1 Mar 1890. Promoted to Lieutenant on 20 Feb 1892, and to Captain on 24 Jun 1899. He served throughout the Second Boer War 1899–1902 (Queen's medal with three clasps and the King's medal with two clasps). In 1904 he was promoted to Major, and in 1914 to Lieutenant Colonel commanding the 4th Battalion Worcestershire Regiment. He was one of the few officers who served throughout the Gallipoli Campaign. In Jul 1916 he was in command of the 88th Infantry Brigade when the Battle of the Somme commenced. The following year he was gassed during fighting near Monchy-le-Preux. He was gassed again in the Battle of Passchendaele. In Mar 1918 he was given command of the 29th Infantry Division with the rank of major general (last commander of the Division.). That year he was made a Companion of the Order of the Bath. For his army service during the First World War he was awarded the Order of the White Eagle of Serbia (3rd class with swords), the Croix de Guerre of France and Belgium and the Order of the Crown of Belgium. During the Second World War he was senior air raid warden for the Yateley district. In 1947 he became a Life Governor of Clifton College. Died aged 81 years. His ashes are interred in the Columbarium at Woking Crematorium.

He married Jessie Eyre Duff Gibbon, daughter of Sir William Duff Gibbon, a tea planter in Ceylon in 1906. Two of his siblings were Major General Sir Walter de Sausmarez Cayley (1863–1952) and Rear Admiral Henry Priaulx Cayley (1877–1942). His son Richard Douglas Cayley (1907–1943) was a distinguished submarine officer during the Second World War.