Attended Auckland University College (now the University of Auckland).
Leslie also had a brother who served in WW1, Angus Matheson, service number 44759.
War service: England
Completed attestation and classified 'C1' by medical examiner, Auckland, 16 September 1917. Enlisted with rank of Private and posted to B Company, C1 Camp, Tauherenikau, Upper Hutt, 17 January 1918. Re-classified as 'A1' (fit for service overseas) by Medical Board, C1 Camp, Tauherenikau, Upper Hutt, 27 February 1918. Transferred to D Company, 39th Reinforcements, Trentham Camp, Upper Hutt, 13 March 1918. Transferred to Specialist Company, 39th Reinforcements, Featherston Camp, Wairarapa, 3 May 1918. Transferred to Specialist Company, 38th Reinforcements, 29 May 1918. Proceeded overseas from Wellington with 38th Reinforcements on board HMNZT 'Remuera', 5 June 1918.
Disembarked Liverpool, England, 31 July 1918; marched into Sling Camp, Bulford, and taken on strength, 3rd (Reserve) Battalion, The Auckland Regiment, 1 August 1918.
Admitted to No 3 New Zealand General Hospital, Codford, 10 October 1918 (Hernia); discharged from hospital to New Zealand Command Depot, Codford, 7 November 1918.
Appointed to rank of temporary Sergeant while employed by Educational Staff at Codford, 20 November 1918.
Struck off strength of Reserve Battalion, The Auckland Regiment, and taken on strength New Zealand Army Education Department, Codford, 5 January 1919. Promoted to rank of Sergeant, granted rank of temporary Warrant Officer Class I (WOI) and appointed to position of 1st Grade Instructor, Codford, 8 January 1919 (retrospectively backdated to 24 December 1918).
Marched out to NZEF Headquarters, London, 13 March 1919.
Granted 28 days' leave to France.
Marched in to Canterbury Provincial Detachment, Sling Camp, Bulford, 1 July 1919; transferred to Auckland Provincial Detachment, Sling Camp, Bulford, 28 July 1919.
Commenced return to New Zealand from Plymouth, England, on board HMNZT 'Tainui', 8 September 1919.
Disembarked Wellington, New Zealand, 21 September 1919.
Discharged on the termination of period of engagement, 19 October 1919.
Medal: British War Medal AWMM