Ireland, Easter Rising: Martial law in Dublin.
Britain: Parliament secret session postpones call up of married men 27-35.
Aisne: After 8-hours barrage 3 French battalions fail to regain ground lost on March 10 until following day, General Mazel suspends operation.
Balkans: Joffre writes to CIGS (Chief of Imperial General Staff) Robertson suggesting Salonika offensive as soon as Serb Army arrives, argues Rumania will come in as a result, but British only acknowledge on May 3.
East Africa: 1st British division through train from Voi reaches Moshi thus joining the German Usambara or Tanga Railway.
North Sea: 4 battlecruisers (under Boedicker, because Hipper is ill) shell Great Yarmouth and Lowestoft (20 civilian and 3 military casualties, c.200 houses destroyed) for 20 minutes. Yarmouth’s shelling shortened by Harwich Force intervention (flagship cruiser Conquest sustains 5 hits, 25 killed). Cruiser Penelope torpedoed by German coastal-submarine UB29 on way home but towed into Chatham.
Coal for Scandinavia not to sail in neutral ships unless with Allied return cargoes.