Hi there,
I believe the book you are looking for "Follow Them up from Carlow" was written by Paul Maguire.
Paul still lives in Carlow and is very involved with the Carlow Military Museum on the Athy Road. Carlow Tourist Office (059/9131554) will have details of the museum and may have a contact number for Paul. The tourist office also have a bookshop and may have a copy of this book for sale. Alternatively, the Carlow Library is about 30 metres away on Tullow Street, and they are very helpful in tracing older books and may be able to give you some advice on securing a copy. Hope this of some help. I know my mum had a copy of the book years ago and it is a great read. Good luck with your search
Ros