12 January 1916

Louis's promotion occurred on 12 January 1916. This was his first diary entry of the new year.

The London Gazette of 25 January 1916 published the following entry:

The King's Own (Yorkshire Light Infantry)
The undermentioned to be temporary Second Lieutenants ( On Probation)
Dated 12 January 1916
Cyril Arthur Pettit
Frank Percy Nilen
Louis Harley

Given the attrition of Second Lieutenants it is gratifying sand surprising that all of the above survived the war.