The code-breakers at Bletchley Park confirmed that an Atlantic raid was imminent, as they had decrypted reports that "Bismarck" and "Prinz Eugen" had taken on prize crews and requested additional navigational charts from headquarters. A pair of Supermarine Spitfires were ordered to search the Norwegian coast for the German flotilla. On the evening of 20 May, "Prinz Eugen" and the rest of the flotilla reached the Norwegian coast; the minesweepers were detached and the two raiders and their destroyer escorts continued north. The following morning, radio-intercept officers on board "Prinz Eugen" picked up a signal ordering British reconnaissance aircraft to search for two battleships and three destroyers northbound off the Norwegian coast. At 7:00 on the 21st, the Germans spotted four unidentified aircraft that quickly departed. Shortly after 12:00, the flotilla reached Bergen and anchored at Grimstadfjord. While there, the ships' crews painted over the Baltic camouflage with the standard "outboard gray" worn by German warships operating in the Atlantic.