Six squadrons (four British, two Canadian) flew the Spitfire Mk IX, the only British fighter equal to the Fw 190, on its operational debut at Dieppe. During the battle, Fighter Command flew 2,500 sorties over Dieppe and achieved a narrow victory over the Luftwaffe. The plan to centralise information gleaned from German radar, W/T and R/T and other transmissions failed because the operation against the landing overwhelmed the reporting system and the war room at 11 Group HQ was overwhelmed with reports as the reaction increased. RAF Kingsdown was not informed about developments and failed to identify German fighter reinforcements arriving from all over France and the Low Countries. The new 6IS Fish party, to decrypt high-speed non-Morse transmissions via the German , had no time to prepare and missed important information. Despite the failures of control and intelligence, the air umbrella prevented the from making many attacks on the landing or the evacuation of the Allied force.