Western Front
Last German night airplane raid on London in which casualties were inflicted; 49 killed and 177 wounded [There were altogether nineteen airplane raids on London during which bombs were dropped, and one air reconnaissance during which no bombs were dropped.] (see May 7th, July 7th and October 19th, 1917 and August 5th, 1918). This is the largest, last and costliest raid on London by bomber aircraft: 28 of 38 Gothas sent (6 lost, 1 crashes), 3 Giants with 600 (14.3t) bombs. British claims are anti-aircraft fire destroys 2 Gothas, and 88 defence sorties shoot down 3 Gothas in 11 interceptions.
The night of 19-20 May 1918 saw the last of the major night raids on England, when 28 G-type and 3 t-type bombers converged on London. Night-flying Sopwith Camels and S.E.5As, together with AA guns, brought down six of he intruders:
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Kaiserschlacht: British trench raid south-west of Meteren. French attack near Locre (Kemmel) bags 400 PoWs on May 20.
Heavy air fighting and many bombing raids behind German front.
France: Heavy German raids on railways and munition dumps (12,500t ammo destroyed until May 22) by Bogohl 6 (and on May 20-21); 935 further British soldiers wounded and nurses killed or injured in 15-plane Gotha raid (1 shot down) on Etaples military camp and hospital complex (key rail bridge, the real target was completely missed) (night May 19-20), repeated (night May 30-31, 47 casualties) when one span of bridge hit, but alternative soon in use (short breaks on June 30 and July 24).
Fayolle diary ‘
… still discord between Petain and Foch. They … ought to be … one single man’.
Southern Front
At Capo Sile (north-east corner of Venetian Lagoons) Italian storming party captures and holds Austrian advanced positions.
Naval and Overseas Operations
Irish Sea: US destroyers
Patterson and
Allen depth charge and sink new coastal submarine
UB-119 west of Cardigan Bay.
Mozambique: In East Africa General Edwards occupies Nanungu without opposition; Germans retire south-west towards Mahua.
Political, etc
China: Agreement signed between China and Japan for naval co-operation (see 16th).