For what its worth;
O'BRIEN DANIEL JOSEPH. Rank: Second Lieutenant. Regiment or Service: Royal Munster Fusiliers. Unit: 3rd Battalion. Attached to 2nd Battalion. Age at death: 33. Date of Death: 10-November-1917. Killed in action. Supplementary information: Son of Mrs. Margaret O'Brien, of Clare Abbey House, Clare Castle, Co. Clare. Grave or Memorial Reference: Panel 143 to 144. Memorial: Tyne Cot Memorial in Belgium.
O'BRIEN, The Hon. DESMOND D. Rank: Flight Lieutenant. Regiment or Service: Royal Naval Air Service. Age at death: 19. Date of Death: 16-February-1915. Supplementary information: Son of the late Edward Donough O'Brien, 14th Baron Inchiquin, of Dromoland Castle, Co. Clare, Ireland (where he was born), and Lady Inchiquin. Educated at Charterhouse College. Grave or Memorial Reference: 12. Memorial: Chatham Naval Memorial In England.
O’BRIEN, GEORGE. Rank: Pte. Regiment or Service: Royal Munster Fusiliers.
Unit;1st Battalion. Date of Death:25-April-1915. Service No:6642.
Born in Drumcliffe, County Clare. Enlisted in Ennis while living in Castleconnell, County Limerick. Died of wounds in Gallipoli. Grave or Memorial Reference: Panel 185 to 190. Memorial: Helles Memorial in Turkey.
O’BRIEN, JOHN. Rank: Pte. Regiment or Service: Royal Munster Fusiliers.
Unit;1st Battalion. Date of Death:15-June-1915. Service No:9667.
Born in Doonbeg, County Clare. Enlisted in Kilrush, County Clare while living in Doonbeg. Died in Gallipoli. Grave or Memorial Reference:XI.E.16. Cemetery: Twelve Tree Copse Cemetery, Gallipoli.
O'BRIEN MARTIN. Rank: Private. Regiment or Service: Royal Munster Fusiliers. Unit: 2nd Battalion. Age at death: 18. Date of Death: 09-May-1915. Service Number: 6015. Born in Kilkee, County Clare. Enlisted in Kilrush, County Clare while living in Kilkee, County Clare. Killed in Action. Supplementary information: Son of Michael and Mary O'Brien, of Ball Alley Lane, Kilkee, Co. Clare. Grave or Memorial Reference: VI. J. 20. Cemetery: Guards Cemetery, Windy Corner, Cuinchy in France.
O’BRIEN, MARTIN. Rank: Pte. Regiment or Service: Royal Munster Fusiliers.
Unit;1st Battalion. Date of Death:28-June-1915. Service No:6002.
Born in St Michael’s, Limerick. Enlisted in Ennis, County Clare while living in Kildysart, County Clare. Killed in Action in Gallipoli. Grave or Memorial Reference: Panel 185 to 190. Memorial: Helles Memorial in Turkey.
O’BRIEN, MICHAEL. Rank: Gunner. Regiment or Service: Royal Garrison Artillery. Date of Death:04-September-1914. Age at Death,35.
Service No:3641. Born in Ennis, County Clare. Enlisted in Ennis.Died at home.
Grave or Memorial Reference:South part of old ground. Cemetery: Ennis (Drumcliffe) Cemetery, County Clare.
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O'BRIEN, MICHAEL JOSEPH. Rank: Private. Regiment or Service: The King's (Liverpool Regiment). Unit: 1st/8th Battalion. Date of Death: 18-July-1917. Service Number: 307325 (CWGC) 237235(SDGW). Born in Kilkee, County Clare. Enlisted in Liverpool while living in Liverpool. Died of wounds. Supplementary information: Son of Frank and Mary O'Brien, of 330, Knight St., Providence, Rhode Island, U.S.A. Born Caherfinick, Co. Clare, Ireland. Grave or Memorial Reference: XVI. D. 10A. Cemetery: Lijssenthoek Military Cemetery in Belgium.
O’BRIEN, PATRICK. Rank: Pte. Regiment or Service: Connaught Rangers. Unit;6th Battalion. Date of Death:21-March-1918. Service No:18132. Formerly he was with the Royal Sussex Regiment where his number was 5424. Born in Killaloe, County Clare. Enlisted in Chelsea while living in Chelsea. Killed in Action. Grave or Memorial Reference: II. D. 5. Cemetery: Templeux-Le-Guerard British Cemetery in France.
O’BRIEN, PETER. Rank: Pte. Regiment or Service: Irish Guards. Unit;2nd Battalion. Date of Death:27-November-1917. Service No:10048.
Born in Inch, County Clare. Enlisted in Ballinasloe, County Galway while living in Ennis, County Clare. Killed in Action. Grave or Memorial Reference: Panel 2 and 3. Memorial: Cambrai Memorial, Louveral, Nord in France.
O'BRIEN, THOMAS. Rank: Leading Seaman. Regiment or Service: Royal Naval Reserve. Unit: S.V. "Mary Fanny." Age at death: 39. Date of Death: 15-September-1918. Service Number: 3720C. Supplementary information: Son of Thomas and Mary O'Brien, of Killard, Doonbeg; husband of Bridget O'Brien, of Killard, Doonbeg, Co. Clare. Grave or Memorial Reference: 29. Memorial: Memorial: Plymouth Naval Memorial, UK.
O’BRIEN, THOMAS. Rank: Private. Regiment or Service: Royal Welsh Fusiliers.
Unit; 9th Battalion. Date of Death: 08-November-1915. Service No: 13264. Born in Kilmurrybricam, Co Clare. Enlisted in Tonypandy while living in Shandrum. Killed in Action. From an article in a Wexford newspaper; Wexford Soldier Killed; It has been officially announced that Private Thomas O’Brien, of the Welsh Fusiliers, a brother of Mr James O’Brien, merchant, South Main Street, Wexford, has been killed in action in France. He resided in Wales for some years and joined the colours after the outbreak of war. Much sympathy is felt with his relatives. Grave or Memorial Reference: Panel 50 to 52. Memorial: Loos Memorial in France.