Frank was the son of Walter Francis and Constance Jane Mattingley née Chennel. In 1911, the family lived at Glenmore and later moved to Rose Cottage on the Petworth Road, Witley. Walter was a foreman at F Milton and Son, builders, of Witley and Harry became a carpenter. On 16th March 1913 he sailed for Halifax (Canada) to become a farmer.
Harry enlisted at Niagara, Canada on 31st August 1915, his enlistment papers show he was 5ft 4½ inches tall with dark hair and hazel eyes. The 24th Battalion was part of the 5th Infantry Brigade, 2nd Canadian Division and took part in the battles of the Somme, Thiepval (26th – 28th September 1916) and Le Transloy (1st – 18th October 1916). Harry was wounded, most likely at Le Transloy, brought to Cliveden Hospital, Taplow, Bucks and operated upon but died later. He was given a military funeral at All Saints’ Church on 24th October with 120 Canadian soldiers, the band of the 100th Battalion from Witley Camp and children from Witley School lined the road. Harry’s funeral was also attended by the Mann family; George Mann joined the Army Service Corps and died of influenza in France in December 1918. Harry’s brother, Frank, was killed at Passchendaele in July 1917.