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|Born||31 May 1889
Attybrick, Tipperary, Ireland
|Died||18 February 1923 (aged 33)
Glen of Aherlow, Tipperary, Ireland
|Known for||Flying Column commander 3rd Tipperary Brigade, IRA|
Denis "Dinny" Lacey (31 May 1889 – 18 February 1923) was an Irish Republican Army officer during the Irish War of Independence and anti-Treaty IRA officer during the Irish Civil War. Lacey was born in 1889 in a village called Attybrick, near Annacarty, County Tipperary.
He joined the Irish Volunteers in 1913 and was sworn into the secretive Irish Republican Brotherhood in 1914. He was introduced to the IRB by Seán Treacy. During the War of Independence (1919–1921) he was selected to commanded an IRA flying column of the 3rd Tipperary Brigade, in September 1920. The flying column mounted two successful ambushes of British forces - killing six British soldiers at Thomastown near Golden, County Tipperary, and four Royal Irish Constabulary men at Lisnagaul in the Glen of Aherlow.
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In December 1921, his unit split over the Anglo-Irish Treaty. Lacey opposed the Treaty and most of his men followed suit. He later commanded the anti-Treaty IRA's Second Southern Division. In the ensuing civil war (June 1922-May 1923), he organised guerrilla activity in north county Tipperary against Irish Free State (pro-Treaty) forces. He was killed in an action with Free State troops at Ballydavid, near Bansha in the Glen of Aherlow on 18 February 1923. He was 33 years old.
Over 1,000 Free State troops, under the command of General John T. Prout, with the intention of breaking up his guerrilla unit, converged on the Glen where he and four other men from his column were billeted. Lacey and one of his men were killed and others captured. Two National Army soldiers were killed in the action. A memorial in Annacarty commemorates Lacey's war service and subsequent death in action.
- Bureau of Irish Military History, Witness Statement of Tadhg Crowe, WS 1658
- "IRA 3 rd Tipperary Brigade Annacarty, Co. Tipperary - Irish Volunteers.org".
- "An Phoblacht/Republican News". Republican-news.org. Retrieved 11 October 2016.
- "Phoenix Publishing". Homepage.eircom.net. Retrieved 31 March 2016.
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