When the Crimean War broke out in 1854, Tredegar, aged 22, held the rank of captain in the 17th Lancers and accompanied his famous regiment to the scene of the great struggle. He was in action at the Battle of Alma and later on 25 October 1854 was in command of a section of the Light Brigade that rode into the 'Valley of Death' at the Battle of Balaclava, which he survived. Godfrey's horse, 'Sir Briggs', also survived, and lived at Tredegar's home, Tredegar House, Newport, Wales, until his death at the age of 28. He was buried in the Cedar Garden at Tredegar House (though not with full military honours as is frequently believed). The monument still stands there today.