The details below are from the Cowley Road Methodist Church Centre
Francis John Liddell was born on 13 August 1874, the son of Samson and Eliza Liddell of Temple Street. He was baptised on 11 November that year at Wesley Memorial Church. The 1901 census records that he was a wholesale clothes cutter. He lived in Bullingdon Road with his wife Sarah.
He became a Company Serjeant Major with C Company, 2nd/4th Battalion Oxford and Bucks Light Infantry and was killed in action in France on 20 April 1918* at the age of 43. He is commemorated on the Pozieres Memorial on the Somme. The memorial commemorates over 14000 casualties of the United Kingdom and 300 of the South African Forces who have no known grave and who fell in France during the retreat on the Somme from 21 March to 7 August 1918. He is also commemorated on the war memorial plaque at Wesley Memorial Church, Oxford.
The databases below suggest the date of death was 31st March 1918.
From the CWGC:
Name: LIDDELL, FRANCIS JOHN
Initials: F J
Nationality: United Kingdom
Rank: Company Serjeant Major
Regiment/Service: Oxford and Bucks Light Infantry
Unit Text: “C” Coy. 2nd/4th Bn.
Date of Death: 31/03/1918
Service No: 201015
Additional information: Husband of Sarah A. Liddell, of 65, Bullingdon Rd., Oxford.
Casualty Type: Commonwealth War Dead
Grave/Memorial Reference: Panel 50 and 51.
Memorial: POZIERES MEMORIAL
Name: Francis John Liddell
Birth Place: Oxford
Death Date: 31 Mar 1918
Regiment: Oxfordshire and Buckinghamshire Light Infantry
Battalion: 2/1st Bucks Battalion.
Type of Casualty: Killed in action
Theater of War: Aldershot