. . . "Operation Wolkenbruch" . "30Bf 110Heavy fighters" . . "Operation Donnerkeil" . . "Operation ''Donnerkeil''" . . . . . "~450 aircraft" . . . "32Dornier Do 217s" . "1942-02-12" . . . . . "Operation Thunderbolt" . "41 aircraft" . . . . "German victory" . "252Bf 109andFw 190fighters" . . . . . . "Unternehmen Donnerkeil" . "his first combat sorties" . . "United Kingdom" . . . . "Operation Donnerkeil" . "subsequent air battle" . . "Donnerkeil" . . . . . . "Germany" . . . . .