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 after the Easter Rising, W. B. Yeats commemorated some of the fallen figures of the Irish Republican movement, as well as his torn emotions regarding these events, in the poem "Easter, 1916". Some of the survivors of the Rising went on to become leaders of the independent Irish state. Those who were executed were venerated by many as martyrs; their graves in Dublin's former military prison of Arbour Hill became a national monument and the Proclamation text was taught in schools. An annual commemorative military parade was held each year on Easter Sunday. In 1935, Éamon de Valera unveiled a