|Place of birth||Camberwell, Victoria|
|Religion||Church of England|
|Address||Subiaco, Western Australia|
|Age at embarkation||23|
|Next of kin||Father, Thomas George Sadlier, c/o Goode, Durrant Ltd., Grenfell Street, Adelaide, South Australia|
|Previous military service||Nil|
|Date of enlistment from Nominal Roll|
|Place of enlistment||Perth, Western Australia|
|Rank on enlistment||Private|
|Unit name||51st Battalion, 7th Reinforcement|
|AWM Embarkation Roll number||23/68/3|
|Embarkation details||Unit embarked from Fremantle, Western Australia, on board HMAT A8 Argyllshire on
|Regimental number from Nominal Roll||Commissioned|
|Rank from Nominal Roll||Lieutenant|
|Unit from Nominal Roll||51st Battalion|
|Fate||Returned to Australia
'For conspicuous bravery during a counter attack by his battalion on strong enemy positions. Lieutenant Sadlier's platoon, which was on the left of the battalion, had to advance through a wood where a strong enemy machine gun post caused casualties and prevented the platoon from advancing. Although himself wounded, he at once collected his bombing section, led them against the machine guns, and succeeded in killing the crews and capturing two of the guns. By this time, Lieutenant Sadlier's party were all casualties, and he alone attacked a third enemy machine gun with his revolver, killing the crew of four and taking the gun. In doing so, he was again wounded. The very gallant conduct of this officer was the means of clearing the flank and allowing the battalion to move forward, thereby saving a most critical situation. His coolness and utter disregard of danger inspired all.'
Source: 'Commonwealth Gazette' No. 185
War service: Egypt, Western Front
Embarked, 25 June 1915. Returned to Australia on board HT 'Nestor', 'On duty, Nursing Staff', 13 March 1916.
Embarked Fremantle, 9 November 1916, as 2858 Pte, 7th Reinforcement, 51st Bn; admitted to Isolation Hospital on board, 11 November 1917; discharged, 28 November 1917; total period of treatment for venereal disease: 18 days; disembarked Devonport, England, 10 January 1917. Marched in to 13th training Bn, Codford, 11 January 1917, and reverted to Private. On Command at NCO's School, Kandahar, 13 February 1917.
Proceeded overseas to France, 9 May 1917; joined unit, 13 May 1917. Promoted Corporal, 18 May 1917.
Promoted 2nd Lieutenant, 14 July 1917.
Wounded in action, 25 April 1918 (gun shot wound, right arm); admitted to 5th General hospital, rouen, 26 April 1918; transferred to England, 27 April 1918, and admitted to 3rd London General Hospital, Wandsworth, 28 April 1918 (wound: slight); to 6th Auxiliary Hospital, 7 June 1918.
Awarded Victoria Cross.
Commenced return to Australia on board 'City of Karachi', 24 August 1918; disembarked Melbourne for overland travel to Perth, 24 October 1918; appointment terminated, 22 February 1919.Medals: Victoria Cross, British War Medal, Victory Medal