The most well-known operation executed by the Apostles occurred on '' Bloody Sunday '' , November 21 , 1920 , when British MI5 officers , linked to the Cairo Gang and significantly involved in spying , were shot at various locations in Dublin ( 14 were killed , six were wounded ) . In addition to the " Twelve Apostles " , a larger number of IRA personnel were involved in this operation . The only IRA man captured during the operation was Frank Teeling . In response to the killings , the Black and Tans retaliated by shooting up a Gaelic football match between Dublin and Tipperary at Croke Park , the proceeds from which were for the Irish Republican Prisoners Fund , killing fourteen civilians including one of the players , Michael Hogan , and wounding sixty-eight . The Hogan stand at Croke Park is named after him
Bloody Sunday
Bloody Sunday (1920)
The Squad (Irish Republican Army unit)