May 19, 1917
The United States Congress adopts the first official American aircraft insignia, a white five-pointed star in a blue disc with a small red disc in the middle. Later in the war America will switch to a roundel to complement the other Allied nations, but will switch back a the end of hostilities. The star-insignia will remain in use until 1942.
Air War:
0645 Irish RFC pilot William Jameson Cairnes, flying SPAD VII B1565, shoots down an Albatros two-seater for victory number 1.
0730 Scottish RFC pilot William Campbell, in Nieuport 17 A6670, destroys a German observation balloon for victory number 2.
0740 William Cairnes scores his second kill of the day, an Albatros D.III, for victory number 2.
0905 German ace Adolf von Tutschek, in Albatros D.III 2274/16, shoots down Sopwith Triplane N5461, for victory number 9. Sub-Lt Geoffrey Glendinning Bowman is listed as Missing.
0910 German ace Karl Allmenröder, in an Albatros D.III, shoots down an unidentified Sopwith for victory number 16.
1030 New Zealand RNAS pilot Thomas Culling, flying Sopwith Triplane N5444, shoots down an Albatros D.III for victory number 5.
1110 German pilot Julius Schmidt, in an Albatros D.III, shoots down SPAD VII A6711 for victory number 3. RFC Capt C.J. Abrahams is killed.
1916 Australian RNAS pilot Richard Minifie, in Sopwith Triplane N5446, shoots down an Albatros D.III for victory number 4.
1945 Australian RNAS ace Roderic Dallas, in Sopwith Triplane N6296, shoots down an Albatros D.III for victory number 17.
1945 English RNAS pilot Cyre, in Sopwith Triplane N5435, shoots down an Albatros D.III for victory number 2.
1945 Malayan RNAS ace Thomas Gerrard, flying Sopwith Triplane N5440, shoots down an Albatros D.III for victory number 6.
2055 German pilot Gisbert-Wilhelm Groos, in an Albatros D.III, shoots down Sopwith Triplane N5488 for victory number 1. Sub-Lt Oliver Ellis is killed.
Ireland:
Carl-Siegfried von Georg, commanding
U-57, sinks British freighter SS
Farnham, 3,102 tons, bound from Bizerta for Glasgow with a load of iron ore. His score is now 37 ships and 37,198 tons.
English Channel:
Hermann Glimpf, in
UB-20, sinks Norwegian freighter SS
Askild, 2,540 tons, carrying a load of coal plus general cargo from Penarth to Saint Vincent, north of Ushant. His score is now 8 ships and 6,602 tons.
His Majesty's Trawler
Kumu, 315 tons, hits a mine laid off Hope's Nose, Torquay, Cornwall by Ralph Wenninger in
UC-17. His score is now 75 vessels and 97,869 tons.
North Sea:
Erich Sittenfeld, in
U-45, sinks Danish schooner
Elise, 137 tons, hauling a load of coal from Hull to Randers. Never seen again, listed as missing. Sittenfeld's tally is now 20 vessels and 31,374 tons.
Gulf of Bothnia:
Karl Vesper, in
UC-58, attacks 9 Swedish ships off the coast of Finland:
Freighter SS
Erik, 785 tons, en route from Stockholm to Raumo with a general cargo; sunk.
Freighter SS
Göta, 1,128 tons; taken as a prize.
Coaster SS
Kjell, 235 tons, transporting a general cargo from Stockholm to Mäntyluoto; scuttled.
Coaster SS
Kyros, 221 tons, carrying a general cargo from Stockholm to Raumo; scuttled.
Freighter SS
Lizzie, 1,095 tons, out of Stockholm for Raumo with a general cargo; prize.
Coaster SS
Märta, 493 tons, en route from Stockholm to Raumo with a general cargo; prize.
Sailing vessel
Olga, 83 tons; scuttled.
Coaster SS
Pauline, 168 tons, carrying 230 tons of cement, electric lamps, axes and iron thread from Öregrund to Raumo; scuttled.
Coaster SS
Therese, 208 tons, traveling from Gävle to Raumo with 295 tons of machinery goods, pig iron and general cargo; scuttled.
Vesper's total is now 15 vessels and 16,256 tons.
Mediterranean Sea:
Johannes Klasing, in
U-34, torpedoes British freighter SS
Mardinian, 3,322 tons, carrying a general cargo from Calicut to London; off Tabarka Island, Spain. His score is now 23 ships and 27,128 tons.
Leo Prásil, in Austrian
U-29, torpedoes British freighter SS
Mordenwood, 3,125 tons, off Cape Matapan. His score is now 3 ships and 14,784 tons.