As a result of the negative assessment about the campaign's future in the East, Hitler forbade any more war studies by the OKW. From what the sources indicate, General Thomas tried unsuccessfully on several occasions to bring the German General Staff and Hitler back to reality about their long-term prospects for success. The pragmatism of Thomas likely contributed to his disillusionment with the regime and its leadership, perhaps leading him to believe that a coup was necessary to stop Germany from being totally annihilated.