We read in the preface by Jean-Jacques Becker to the reissue of the tetralogy Ceux de 14 by Maurice Genevoix (Le grand livre du mois, 2000, p. XI) that "we now know" that the officer who commanded the patrol which included Alain-Fournier gave the order to "shoot German soldiers encountered unexpectedly and who were stretcher-bearers", hence the severity of the German reaction. de:Ludwig Harig found documents in the military archives containing details of the events of September 22, 1914. French soldiers had attacked a German ambulance and killed two seriously injured soldiers by blows to the head. Then the French soldiers were executed, the writer among them. (Frankfurter Allgemeine Zeitung, May 12, 2001: "Spuren einer Schlacht").
worldcat.org
Tucker, Spencer C .; Roberts, Priscilla Mary (2005). Encyclopedia of World War I. Vol. 1. ABC-Clio. p. 57. ISBN1-85109-420-2. OCLC61247250.
