A night raid by German aeroplanes on London (44 killed); five of the raiders are destroyed.
German airmen bomb a group of British hospitals at Etaples and cause many casualties.
May 20 (Mon.)
The French gain ground near Locre.
May 21 (Tues.)
A German aeroplane raid on Paris (three killed); one raider is brought down.
A British air-raid on Mannheim.
May 22 (Wed.)
A German aeroplane raid on Paris (one killed).
British airmen raid Zeebrugge and sink a German destroyer.