Admiral Scheer akanga ashandisa chiedza pamusoro mauto kurwisa British Convoys kuNorway kutanga mukupera 1917. Somugumisiro, Royal Navy akabatanidza boka rengarava dzehondo kudzivirira Convoys, izvo akauya Scheer pamwe mukana kuparadza munhu akaparadzaniswa chikwata cheGreat Fleet. Scheer akataura kuti "A kubudirira kurwisa pamusoro Convoy kwakadaro kwete chete kuguma kunyura zvakawanda tonnage, asi kwaizova kubudirira zvikuru zvechiuto, uye... kumanikidza Chirungu kutumira zvakawanda zvikepe zvehondo kuti kuchamhembe mvura". Scheer akatanga kunyatsoteerera Wireless kunyarara mukugadzirira kurwisa. Izvi zvakaramba British kukwanisa kuvhara uye decrypt German zviratidzo, izvo zvakanga zvakakosha kunzi kushanda.
yakaputitswa nechikepe chepasi pemvura chinonzi E42