I managed to locate my 3 x Great grandfather(up until then I had hit a brick wall) from his army records. If your Irish ancestor joined the British Army then his records will be at the Public Records Office at Kew, London. Name indexes are now available on the PRO website. Army records can give you a lot of information about your ancestor. They even tell you what he lookedlike.
Snippets: March/April's subject is 'My ancestors were in Entertainment'
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