After giving so much detail and ending you post with “..help”, it’s not clear what you are looking for from a posting on the Boer War Board.
Other than his medal entitlement (see WO 100 Campaign Medal Rolls on Ancestry) there will be very little available about his time in South Africa; for an overview see http://angloboerwar.com/unit-information/imperial-units/650-...
A note on the actual Queen’s South Africa Medal Roll shows he was posted to the 2nd battalion at some point before 15th August 1903, being the date the medal roll was signed off. He is listed as being entitled to 3 clasps with his QSA Medal: Transvaal, South Africa 1901 & South Africa 1902.
Any details of that and other postings should be in any record that survives, but as he went on to serve in WWI any record will have been combined in his WWI service file. Unfortunately most of the soldier’s WWI files were destroyed in bombing during WWII and any that do survive will be on Ancestry.
The catalogued description to his WWI Medal (roll) Index Card on the National Archives new Discovery web page at http://discovery.nationalarchives.gov.uk/SearchUI/Details?ur...
(High quality colour scans of original cards on Ancestry)
Medal card of Ward, Thomas
Corps: Regiment No: Rank
Royal Irish Regiment; 6905; Private
Highland Light Infantry; 3299315; Private
The above shows he transferred to the Highland Light Infantry and the 7-digit number 3299315 indicates he was still serving in 1920 when the whole army was issued new numbers, which would be unusual for someone who had served in the Boer War and who was still a private soldier.
If you are unable to locate his record on Ancestry then there’s a slight possibility (no guarantees) he went on to serve after the 1923 cut-off for records being in the public domain and his record may still be with the MoD.
There’s a £30 GBP non-refundable charge and you will need to provide proof of death.
See details at http://www.veterans-uk.info/service_records/service_records....