Hi Dermo, yes he would have got a pension, he may not have got it till 1932/33 when Fianna Fail came into power for the first time, as the cosgrave goverment had blocked some pensions for men that took the anti treaty side.
Pensions Dept,
Department of Defence,
Áras an tSáile,
Renmore,
Galway
Or you could google a phone number & give then a ring I am sure they will help you out.
Gary