I wonder if he was involved in what is described here? It's all rather interesting, a bit like the German equivalent of the Russian's 'Night Witches' squadrons, only they were all female pilots!
"By 1942, the Russians began using obsolete aircraft such as the Polikarpov Po-2 to conduct night harassment missions against the Germans. Noting the success of the raids, the Germans began conducting their own night harassment missions with obsolete aircraft on the Eastern Front. In December 1942, the first Störkampfstaffel (harassment squadron) was established and equipped with Gotha Go 145 and Arado Ar 66. The night harassment units were successful and by October 1943 there were six night harassment squadrons equipped with Gotha Go 145."
Courtesy of Wiki.