https://legal.un.org/ilc/publications/yearbooks/english/ilc_1992_v2_p1.pdf "Report on State Responsibility"], by Gaetano Arangio-Ruiz, United Nations document A/CN.4/444 (1992) Herr Wilhelm von Mayer, Germany's chargé d'affaires to France, met with Prime Minister Alexandre Millerand and said that some German troops had entered the demilitarized neutral zone (the 50 kilometers west of the Rhine River) on Thursday evening, but requested a waiver of the treaty in order to confront the leftist rebels.