April 23, 1918
Air War:
0830 German ace Erich Löwenhardt, flying an Albatros D.V, shoots down a Bristol F.2b for victory number 17.
0900 Canadian RAF pilot Earl Hand, in Sopwith Camel B2430 over the Italian Front, shoots down an Albatros D.III for victory number 3.
0900 Australian RAF pilot Cedric Howell, in Sopwith Camel B5238 over the Italian Front, shoots down an Albatros D.III for victory number 3.
0955 Two American SPAD pilots share a victory over an Albatros D.V:
Paul Baer, victory number 5.
Charles Herbert Wilcox, victory number 1.
1115 French ace Alexandre Marty, in a SPAD, shoots down a Hannover CL two-seat fighter for victory number 6. This is probably Ltns Heinrich Ohler and Otto Hickmann of FlAbt 242, both killed.
1355 English RAF pilot Francis Mellersh, flying Sopwith Camel D3329, shoots down a DFW C.V for victory number 5. This is Mellersh's last aerial victory. He will survive the war and remain in the RAF, serving through World War 2. In May 1955 Mellersh will be killed in a bizarre accident involving a yacht and a helicopter.
http://www.theaerodrome.com/aces/england/mellersh.php
1415 English RAF pilot Cyril Lowe, in SE.5a D275, shoots down a Pfalz D.III for victory number 3.
1415 English RAF ace Ronald Mark, in SE.5a C6417, shoots down a Pfalz D.III for victory number 13.
1430 German naval pilot FlgMstr M. Brenner, with Marine Feld Jasta I, shoots down a "Sopwith" for victory number 4. This is Brenner's last aerial victory. He is last mentioned serving with the land-plane division as of June 14, 1918.
1550 English RAF observer Philip Holligan, riding in DH.9 C6114 with Lt A.H. Curtiss as pilot, shoots down an Albatros D.V for victory number 3.
1750 English RAF pilot Thomas Rose, in SE.5a C5393, shoots down a German two-seater for victory number 2.
1820 Canadian RAF ace Albert Carter, flying Sopwith Dolphin C4017, is credited with shooting down two Pfalz D.IIIs for victories number 22 and 23.
The second is shared with Canadian pilot Gordon Irving in Sopwith Dolphin C3799, victory number 2.
1855 German pilot Egon Koepsch, with Jasta 4, shoots down SE.5a C1086 for victory number 2. English 8-victory ace Capt Kenneth William Junor is killed.
1920 English RAF ace Oliver Redgate, in Sopwith Camel B7250, shoots down a Pfalz D.III for victory number 13.
1930 English RAF observer William Middleton, riding in DH.4 A8071 with Lt G.E. Siedle as pilot, shoots down a Fokker Dr.I for victory number 2.
1940 English ace pilot Euan Dickson and observer Charles Robinson, in DH.4 A7739, shoot down a Fokker Dr.I. Victory number 10 for Dickson; number 3 for Robinson.
German ace Heinrich Arntzen, in OAW Albatros D.III 2480/17, claims a Bréguet 14 for victory number 11. This is possibly a Salmson 2A.2 flown by Capt Georges Flouch and Lt Henri di Barres, both killed.
Two French pilot share a victory over a German two-seater:
Jacques Gérard, SPAD VII S4236, victory number 4.
Mdl Gentil, SPAD, victory number 1.
Jacques Gerard scores a second victory, shooting down another teo-seater for number 5.
German pilot Uffz Hess (no first name given), with Jasta 60, shoots down a Bréguet 14 for victory number 3.
German ace Theo Osterkamp, in an Albatros D.V with MFJ II, shoots down a Sopwith Camel for victory number 9.
French pilot Gabriel Thomas, flying a SPAD, shoots down a German two-seater for victory number 2. This is probably Uffz Otto Schenke and Obltn Georg Schmidt of FlAbt 254, both killed.
German ace Wilhelm Zorn, with Jasta 60, shoots down a Bréguet 14 for victory number 8. This is probably Cpl Guillaume Tilloy and Asp Léon Barbaut, who are both wounded but land safely on their own side of the lines. They also claimed an Albatros, victory number 1 for both, and Zorn crashed on their side and was taken prisoner.