remarkable (read the book's chapter on the gun placements on the Mohne).
Not read it but one Sgt Nav, 'Spike' Hughes who was later S Int O at Waddo in 1967 flew his first and only mission immediately following the dams raid. Int briefed them that it would be a cake-walk was all the searchlights and flak would be kaput because of the floods.
He got shot down. He said that Int had not realised all the searchlights were powered with portable generators.