AA guns fired 2450 rounds, claim 3 shot down. RAF shot down at least 2, possibly 6. At least five aircraft are shot down and later intelligence reports that several damaged aircraft failed to make it back to their bases. The Luftwaffe never again attacked Scapa in such strength. Churchill praises Scapa's defences for repelling the attacks: "The batteries can deliver...what is probably far the heaviest concentration of anti-aircraft fire in the world." WSC 11-4-1940
Source: @Ness_Battery