The website "The Long Long Trail" (
www.1914-1918.net) has some info:
http://www.1914-1918.net/dubs.htmWhich says:
10th (Service) Battalion
Formed in Dublin in late 1915. Moved to Buttevant, then in June 1915 to Ballyhooley. Moved to England in August 1916, going to Pirbright.
19 August 1916 : landed at Le Havre and placed under command of 190th Brigade in 63rd (Royal Naval) Division.
23 June 1917 : transferred to 48th Brigade in 16th (Irish) Division.
24 October 1917 : absorbed surplus troops from 8/9th Bn.
15 February 1918 : disbanded in France, men going to 19th Entrenching Battalion.
And details of the 10th (Irish) Division:
http://www.1914-1918.net/10div.htmClass Z Reserve was authorised by an Army Order of 3 December 1918. There were fears that Germany would not accept the terms of any peace treaty and therefore the British Government decided it would be wise to be able to quickly recall trained men in the eventuality of the resumption of hostilities. Soldiers who were being demobilised, particularly those who had agreed to serve “for the duration”, were at first posted to Class Z. They returned to civilian life but with an obligation to return if called upon. The Z Reserve was abolished on 31 March 1920.
King's Regulations, paragraph 392 (xxviii) says: Discharged (xxviii) On demobilization.