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
Octave of Easter Missal, which called this Sunday the Second Sunday of Easter. In the third edition of this Missal, promulgated in 2000 but published only in 2002, the Sunday took what is now its official name: "Second Sunday of Easter or of Divine Mercy". In Anglican churches, the Second Sunday of Easter is widely known as Low Sunday, both because rituals are lower than they were the week before, on Easter Day, and because church attendance is usually a fraction of what it was on the feast day. Even the Churchman's Ordo Kalendar, which contains all saints' and holy days, refers to