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
John Redmond after 1916 was increasingly eclipsed by ill-health, the rise of Sinn Féin and the growing dominance of Dillon within the Irish Party. June 1917 brought a severe personal blow to Redmond when his brother Willie died in action on the front at the onset of the Battle of Messines offensive in Flanders; his vacant seat in East Clare was then won in July by Éamon de Valera, the most senior surviving commandant of the Easter insurgents. It was one of three by-election gains by Sinn Féin, the small separatist party that had played no part in the Rising, but was