Western Front: First 2 German MG-armed Fokker Els with interrupter gear arrive. First FE2b flown to France; RFC No 6 Squadron has 4 by September, 32 in service by December.
Eastern Front: Airship LZ30 accidentally burned in Posen shed.
Flanders: First British (Royal Navy) kite balloon ascends near Poperinghe.
Southwest Africa: Botha meets Seitz at Giftkop (c.30 miles north of Karibib) during 48-hours ceasefire. Seitz proposes armistice and neutral zone until general peace. Botha insists on unconditional surrender. 4,000 Germans still at large to north.
Russia: Death of Admiral Essen, C-in-C Russian Baltic Fleet, aged 55. Succeeded by Vice-Admiral Kanin.
Italy: Government given extraordinary war powers, publishes Green Book on negotiations. Mobilization ordered for May 22.