Richard Overy, professor of modern history at King’s College, London, explained in his book Russia’s War — Blood Upon the Snow: “Metropolitan Sergei [Sergius], head of the Church, appealed to the faithful on the very day of the German invasion to do everything to bring about victory.
Richard Overy, profesor sejarah modern di King’s College, London, menjelaskan dalam bukunya Russia’s War — Blood Upon the Snow, ” Metropolitan Sergei [Sergius], kepala Gereja, pada hari terjadinya invasi Jerman, menggugah orang - orang yang beragama untuk melakukan apa pun guna membawa kemenangan.