"O Valiant Hearts" is a hymn remembering the fallen of the First World War. It often features prominently in annual Remembrance Day services in the United Kingdom and the British Commonwealth. Words were taken from a poem by Sir John Stanhope Arkwright (1872–1954), published in The Supreme Sacrifice, and other Poems in Time of War (1919). It was set to music by the Rev. Dr. Charles Harris (1865-1936) who was Vicar of Colwall, Herefordshire between 1909-1929. It is to his tune, referred to as Har...