While the war slowly ran its painful course, Delsarte continued to undertake duties for French mathematics both in Nancy and in Paris at the Centre National de la Recherche Scientifique where he served on a pure mathematics commission, and also as an examiner for entry to various Écoles.
Habang ang digmaan dahan-dahan ran nito masasakit na kurso, Delsarte patuloy na magsagawa ng tungkulin para sa French matematika pareho sa Nancy at sa Paris sa National Center de la mabini Scientifique kung saan siya nagsilbi sa isang purong matematika komisyon, at din bilang isang tagasuri para sa entry sa iba't-ibang Écoles .