Hopefully someone with better access to French and German combat reports can help me clear up this question.
Around noon on May 25,
Ernst Udet led Jasta 15 from the field at Boncourt. Out of the blue, his roommate "Puz" Haenisch was shot down by a French scout attacking from out of the sun. Here's an excerpted description of the event in Udet's memoir:
"I make a half turn and in that instant I see, close to my side, not twenty meters off, Puz's aircraft enveloped in fire and smoke. But Puz himself sits straight up in the center of this inferno, head turned toward me. Now he slowly lifts his right arm to his crash helmet. It could be the last convulsion, but it looks as though he were saluting me for the last time. "Puz," I scream, "Puz!" Then his machine breaks up. The fuselage dives straight down like a fiery meteor, the broken wing planes trundling after it. I am stunned as I stare over the side after the wreckage. An aircraft moves into the range of my sight and tears westward about five hundred meters below me. The cockades blink up at me like malicious eyes. At the same moment I have the feeling that it can only be Guynemer! I push down, I have to get him! But the wings of the Albatros are not up to the strain. They begin to flutter more and more, so that I fear the machine will disintegrate in the air. I give up the pursuit and return home."
Now, May 25, 1917 is the day when Guynemer famously scored four kills, all of them were two-seaters though, and Udet's men were flying Albatros fighters. Probably that means this was not Guynemer who killed Haenisch.
So, who killed Haenisch? I'd be interested to hear what the records say on the subject.
Thanks,
TaurusRising