Returning to Dublin O'Connor joined " The Squad " under Michael Collins and killed Captain John FitzGerald of the " Cairo Gang " on Bloody Sunday in 1920 . By the end of the Irish War of Independence he was Commandant of the 3rd Battalion " Dev 's Own " . He was a member of the Irish Republican Army 's " Banned Convention " in 1922 and in the Battle of Dublin during the Irish Civil War he held the Fianna HQ in York Street near St Stephen 's Green . He escaped to Limerick and succeeded Ernie O'Malley as the Quarter-Master-General of the IRA with the rank of brigadier-general
Bloody Sunday
Bloody Sunday (1920)
Joseph O'Connor (Irish politician)