 On 29 September 1918 his oldest son Lieutenant Francis Harold Langhorne was killed in action while serving with the 2nd Canadian Mounted Rifles in northern France.After the first world war he visited the grave at Borlon wood, arranging for an epitaph to be added.He went to Cairo in 1919 as Deputy Director of Ordnance Supplies for General Edmund Allenby, 1st Viscount Allenby.