Easter Rising in putting the rising off for only a day, although it greatly reduced the number of Volunteers who turned out. British Naval Intelligence had been aware of the arms shipment, Casement's return, and the Easter date for the rising through radio messages between Germany and its embassy in the United States that were intercepted by the Royal Navy and deciphered in Room 40 of the Admiralty. The information was passed to the Under-Secretary for Ireland, Sir Matthew Nathan, on 17 April, but without revealing its source, and Nathan was doubtful about its accuracy. When news reached Dublin of the capture
Easter Rising 23 April, the Military Council met at Liberty Hall to discuss what to do in light of MacNeill's countermanding order. They decided that the Rising would go ahead the following day, Easter Monday, and that the Irish Volunteers and Irish Citizen Army would go into action as the 'Army of the Irish Republic'. They elected Pearse as president of the Irish Republic, and also as Commander-in-Chief of the army; Connolly became Commandant of the Dublin Brigade. Messengers were then sent to all units informing them of the new orders. On the morning of Monday 24 April, about 1,200 members of