Catherine McGauran (21st June 1873 Cavan Ireland

?)not sure if its her,and Joseph Appleby 1864c born Bloxwich Stafford.had a son born 1894 in barracks in Athlone,then a daughter born in barracks at Newcastle on Tyne 1897,but where were Catherine and Joseph married,Athone??? but I can't find anything any where,can someone point me in the right direction please,also how do I find his army Records,where he served etc.sorry if I sound thick but I'm really stuck.
Elton.