[Sailor Steve]

May 21, 1917

Air War:
Austrian 3-kill pilot Kurt Gruber, after five months as a test pilot, returns to the frnnt only to crash Hansa-Brandenburg D.I 28.14, putting him out of action until September.

1030 Scottish RNAS pilot Gerald Ewart Nash, flying Sopwith Triplane N5492, shoots down an Albatros D.III for victory number 1.

1630 English RFC pilot James Green, in FE.2b A6419 with Pvt H. Else as observer, shoots down an Albatros D.III for victory number 5.

1630 English RFC pilot Alexander Roulstone, in FE.2b A6381 with observer Lt H. Cotton, shoots down an Albatros D.III for victory number 3.

1740 German pilot Eberhard Mohnicke, in an Albatros D.III, shoots down an FE.2d for victory number 2. 2nd Lts J.H. Blackall and B.C. Moody are both wounded and taken prisoner.

2000 Scottish RFC pilot William Campbell, in Nieuport 17 A6670, shoots down an Albatros D.III for victory number 3.

German ace Walter von Bülow-Bothkamp, flying an Albatros D.III, destroys two French observation balloons for victories number 14 and 15.

Russian pilot Ivan Orlov, in a Nieuport 17, shoots down an Albatros two-seater for victory number 5.

German pilot Theodor Quant, in an Albatros D.III shoots down two German balloons for victories number 1 and 2.



Ireland:
His Majesty's Trawler Senator, 211 tons, hits a mine laid by Alfred von Glasenapp in U-80, off Tory Island, north of Ireland. His score is now 12 vessels and 31,809 tons.



Celtic Sea:
Karl Edeling, in U-48, sinks two ships south of Queenstown, Ireland:
Russian barque Lynton, 2,531 tons, sailing from Pensacola to Clyde with a load of timeber.
Norwegian barque Madura, 1,906 tons, en route from Gulfport to Cardiff with a load of timeber.
Edeling's score is now 6 ships and 23,203 tons.

Thomas Bieber, in UB-31, torpedoes British freighter SS City of Corinth, 5,870 tons, carrying a general cargo from Singapore to London, just off the Lizard, west end of the English Channel. His score is now 3 ships and 20,086 tons.



English Channel:
Hans Howaldt, in UB-40, sinks British freighter SS Jupiter, 2,124 tons, travelling in ballast from Dieppe to Manchester; off Beachy head. His score is now 33 ships and 41,764 tons. Jupiter had previously survived a scuttling attempt by Victor Dieckmann in UB-27 on October 7, 1916.

Gustav Buch, in UC-36, torpedoes French freighter SS Ferndinand A., 2,062 tons, in a convoy from Clyde to Nantes. His score is now 23 ships and 33,439 tons.
While attempting a second attack on the convoy UC-36 is rammed by French freighter SS Molière. The U-boat sinks with the loss of all 27 hands.



Mediterranean Sea:
Johannes Klasing, in U-34, comes across French brigantine Saint Michel abandoned and adrift. Klasing scuttles the ship, raising his total to 25 vessels and 30,909 tons.

Hermann von Fischel, in U-65, sinks two British freighters northwest of Malta:
SS Ampleforth, 3,873 tons, carrying a load of coal and crated aircraft from Barry to Alexandria.
SS Don Diego, 3,632 tons, underway from Swansea to Alexandria with a load of government supplies.
Von Fischel's score is now 20 ships and 47,650 tons.