Theatre of War section: 2b = Gallipoli and Aegean Islands (he entered on 13 Sept 1915)
He was discharged on 7 December 1917 (as per a WW1 Service Medal and Award Rolls record)
Service #4590: Lancashire Fusiliers (9th Battalion) Rank: Private
Service #242865: Lancashire Fusiliers (2/6th Battalion) Rank: Corporal
He was awarded the three WW1 campaign medals — The 1914 Star or 1914-15 Star, British War Medal and Victory Medal. (The handwritten notations to the right of each Medal refer to the WW1 Service Medal and Award Rolls and page numbers where Thomas Barnes' medal awards appear).
He also received the Military Medal (awarded for "acts of gallantry and devotion to duty under fire").
A London Gazette issue (dated late July 1917) records that Thomas received the MM.
UK, British Army Recipients of the Military Medal, 1914-1920
Name: Thomas Barnes
Regimental Number: 242865
Regiment: Lancashire Fusiliers
Rank: Corporal
Medals: Military Medal
NOTE: Gallantry medals are awarded for an especially heroic deed or action. Announcements are listed in the official journal The London Gazette. For some but not all awards, there may also be a separate citation, which describes the action for which the award was made. There are no citations for awards of the Military Medal or Mentions in Despatches.
Operational records or a published regimental/unit history might provide some details, although the individual may not be named. Newspapers may also include an account of the action although for security reasons key details such as locations and unit names are usually removed.