On Saturday, April 22, 1916, the Easter Rising, originally planned for the following day, Easter Sunday, is postponed for one day.
At dawn a messenger from the Kerry Volunteers arrives in Dublin and informs James Connolly, Commandant of the Dublin Brigade, that Roger Casement had been arrested in County Kerry the previous day during a failed attempt to smuggle arms into Ireland on board the German ship Aud. A meeting of the Military Council is hastily organised, and the decision is made not to inform Chief-of-Staff of the Irish Volunteers, Eoin MacNeill, about Casement’s arrest.
Later in the morning, after attempting to escape the area, Karl Spindler, captain of the Aud, makes the decision to scuttle his ship after it is intercepted by the Royal Navy. Although Spindler and the crew are rescued, the armaments on board the Aud are lost. By early afternoon the Military Council is made aware of the loss of their arms shipment.
At 6:00 PM, Sean Fitzgibbon, Colm O’Loughlin, and Michael Joseph O’Rahilly arrive at Woodtown Park and inform MacNeill of the arrests and the loss of the Aud. After confronting Patrick Pearse at St. Enda’s School, a bilingual school for boys founded by Pearse, MacNeill and others, including O’Rahilly and Bulmer Hobson, gather at the house of Seumas O’Kelly on Rathgar Road and a decision is made to issue countermanding orders cancelling the Rising planned for Easter Sunday. To make sure that the countermanding order is received and understood, James Ryan is sent overnight to Cork, Colm O’Loughlin to Dundalk and Coalisland, Sean Fitzgibbon to Waterford, and Min Ryan to Wexford. O’Rahilly travels to Limerick, Kerry, Cork, and Tipperary. This succeeds in delaying the rising for only one day, although it greatly reduces the number of Volunteers who turn out.
During the evening, Major-General Sir Lovick Friend, General Officer Commanding of British forces in Ireland, travels to London on leave in wake of the capture of the Aud believing that any potential insurgency has been stopped. Chief Secretary Augustine Birrell is also in London having attended a Cabinet meeting. Both men remain in London through Easter, leaving Under Secretary Matthew Nathan as the most senior British official remaining in Dublin. Lord Lieutenant of Ireland, Ivor Churchill Guest, 1st Viscount Wimborne, urges Nathan to order the arrest of a large number of rebel leaders however he is unwilling to do so without the authorisation of Chief Secretary Birrell.