Can anyone help me find out which regiment a John Christopher Hayden served ?

Question

John Hayden born 1878 died 1942 from Findlater St. Dun Laoghaire (formerly known as Kingstown) Dublin Ireland

any help greatly appreciated

Answer 1

There were so many John Hayden’s born in Dublin about that time, do you have any more info?

Comments

I left his information in the  main body of the question.  Other  information I have is that he married a Bridget Lyons. It would be the british army  as ireland was still under british rule and  the war of independence was about to start.