No 46 Parnell Square – Formerly the Headquarters of Conradh na Gaeilge, the Irish language league, this was the venue where Thomas MacDonagh assembled the 2nd Battalion the Sunday night on the eve of the 1916 Easter Rising. In August 1917, the meetings that led to the National Executive of the Irish Republican Army being established were also here, with persons present including Éamon de Valera, Thomas Ashe, Cathal Brugha, and Michael Collins. Subsequently on 19 September 1919, in the company of Richard Mulcahy, Michael Collins set up his famous "Squad", composed of top-level operatives – men who would ultimately be involved with highest priority missions, such as the elimination of the British "G Men" agents in 1920.