The film "The Dam Busters" premiered on 16th/17th May 1955 (the 12th anniversary of the raid), attended by numerous survivors of the raid. It is a reasonable portrayal of the story of the development of the "bouncing bomb" and Operation Chastise itself (and of the characters involved in the story), but like all cinematic versions, there are some inaccuracies, omissions or inconsistencies (for whatever reason). This list gives some detail on the factual inaccuracies that I've spotted in the film:

• Upkeep: the bomb shown beneath the attacking Lancasters in the film is too large and too spherical in shape; this suggests continuity with the earlier footage of real test drops, but is more likely due to the secret nature of the Upkeep weapon (it was still secret when the film was made, details only being released in 1963 - hence in some of the real test drop footage from the Wellington and Mosquito, the bomb is masked out by a black disc). There is no hint of the mechanism used to spin the bombs, this feature going unmentioned in the film as it was still secret. The shots of the bombs bouncing towards the dams in the film are actually archive shots of Highball tests on Loch Striven. [There is no archive footage of Upkeep test drops with a suitable background.]
• Other Aircraft: During the crew briefing in the film (and very prominently in the cinema trailer for the film), Gibson remarks that 617 will be the only squadron operating that night. This is also stated in Gibson's book and Morpurgo's biography of Wallis, although Sweetman and Cooper note that other squadrons were flying that night (including "gardening" (mine-laying) operations all along the enemy coast (with 54 aircraft, one of which was lost), and a 9 Mosquito raid on Berlin; major bombing raids were off due to the full moon) - see my Big & Bouncy page for references). [Cooper and Sweetman are correct, according to the Bomber Command diary for May 1943.]
• The spotlights: The idea of the triangulated spotlamps to set the aircraft height is shown as being Gibson's, during a visit to the theatre; in fact it was Benjamin Lockspeiser (Chief Scientist at the Ministry of Supply) who came up with the idea, it having been used as far back as World War I. Also in the film, the height spotlamps are shown under the nose and tail of the Lancasters; in fact the second spotlamp was in the rear of the bomb bay. In many art prints of the dams raid, the spotlamp beams are incorrectly shown shining down directly beneath the aircraft (where they could not have been seen from the cockpit). See my Big & Bouncy page for details of the spotlamp mounting.
• Hitting the dams: In the film, all the mines hit the dams (with the exception of Hopgood's at the Möhne and Maudley's at the Eder) and it appears to take several hits to break the dams, contrary to Wallis' theory that one hit in the right place would be enough. In fact, it was the first correctly placed mine which actually broke the dam in each case, just as Wallis predicted (see my Big & Bouncy page for details of the attack). The last mine was dropped at the Möhne (by Maltby) just as the dam was already crumbling following the hit by Young. [This error, which actually reflects badly on Wallis, is probably down to wanting it to appear as though all the aircraft bombed accurately.]
• The Eder: In the film, the second mine dropped at the Eder (by Maudslay) is dropped too late and the explosion causes the aircraft to crash into the hillside after a last faint radio message. However, it is now known that Maudslay's aircraft actually crashed in Holland, so it was either not damaged by the explosion of the mine (other than perhaps the radio), or took longer to succumb to the damage than is suggested. [This error is probably due to the records of the time which showed Maudslay as lost over the Eder.]
• The Sorpe: Although mentioned as one of the raid's targets during the crew briefing in the film, the actual attack on the dam, and the different method of attack, are not shown. [This omission is probably due the anti-climax it would have produced, as the Sorpe was not breached.]
• The Lancasters: The Lancasters that appear in the film came from the Maintenance Unit at RAF Hemswell, having the 617 Squadron code letters applied (Gibson's aircraft also got the ED932 registration, though others kept their real registrations) as well as having the dorsal turrets removed (as the real aircraft had had) and the addition of the oversized dummy Upkeeps. Most of the original Lancasters saw no further action during the war, and were scrapped after the war ended, including Gibson's aircraft (AJ-G / ED932) which was scrapped in 1946 (sacrilege???).All the aircraft used in the film were broken up for scrap in 1956. The film aircraft appear to have 2 x 0.5" machine guns in the rear turrets, though the original aircraft would have all had 4 x 0.303" machine guns there; ammo seen being loaded also appears to be 0.5". [ This detail was probably overlooked when making the film. ]
• Test dams and testing tank: The catapult shown for testing the bouncing bomb in the National Physical Laboratory's tank at Teddington is the original device; this is now owned by the RAF Museum, although it is currently on loan to the Barnes Wallis Collection at Elvington, nr. York, where it can be viewed by visitors. The sequences in the testing tank were filmed in the actual tank (although the number 1 tank was used, as it was more photogenic than the number 2 tank where Wallis did all but one of his actual tests); the tanks were demolished in 1998. The original model of the Möhne Dam used for explosives testing still exists (though a bit overgrown), and in 2003 was declared a "scheduled monument". The dam models seen in the film are the actual briefing models made by the PRU at RAF Medmenham, although the Eder model was not completed in time so was not available to the crews; these are now held by the Imperial War Museum (the Möhne model is on display at their London site).
• The explosions: as real explosions on the scale of the dam models would not have been impressive, the explosion effects were created using a matte made from the film of the explosion of the only live test of an Upkeep
• Young's oar: "Dinghy" Young was in the victorious 1938 Oxford crew in the Boat Race, and at the end of the film we see on his wall an oar painted with the names of the crew. The oar is a genuine souvenir of the race, having been borrowed from Young's family for use in the film.
• Gibson's Mae West: Complaints have been made that the lifejacket worn by Todd in the film is not the type worn by RAF servicemen in 1943. However, after shooting down a Heinkel 111 during his nightfighter days, Gibson went to Skegness (where the aircraft crashed) and claimed one of the German lifejackets as a prize, and he wore this himself from then on - it is thus (correctly) a German lifejacket that Todd is seen wearing in the film.
• Wallis: Although Michael Redgrave's performance probably captures the essence of Wallis, his character in the film absorbs some of the other technicians involved, so that Wallis appears to be credited personally with some of the research and ideas that were not actually his. Michael Redgrave sat in on some meetings with Wallis to feed into his characterisation, and Wallis was mostly happy with his portrayal in the film. Redgrave is alleged to have told Wallis "I'm not going to imitate you, you know" to which Wallis replied "Oh no, you must create me!" Redgrave was 47 when the film was made (Wallis was 56 in 1943) and was knighted when he was 51 (Wallis had to wait until he was 81 for his knighthood)!
• The music: "The Dam Busters March" by Eric Coates is heard throughout the film; it appears to have been written for the film (one of few film commissions accepted by the composer), although some sources claim it was written earlier. Coates died in 1957; he is well known for other light British classics, including "By a Sleepy Lagoon" used as the theme to the long-running "Desert Island Discs" on BBC radio (1942-present).
• Nigger: This was the name of Gibson's black Labrador dog, killed in a hit-and-run accident on the day of the mission (in the film). In fact, the fatal accident took place the day before, and the car did stop (it was driven by an RAF officer). "Nigger" was also the codeword to indicate the breaching of the Möhne Dam; although today deemed politically incorrect (despite the fact that it simply stems from the Latin word for black), it is still used in the recent DVD release of the film, despite earlier suggestions that the film should be sanitized (some US releases of the film had all references to this word cut or overdubbed with "Trigger", although the Morse code transmission heard still said "Nigger" and it does appear in the US DVD release of the film). The UK Channel 4 screening in July 2007 also cut all uses of the word, although the digitally remastered version being shown in cinemas at the same time remains uncut. Sharp-eyed viewers may spot the "ghost of Nigger" running through the trees at the end of the film (where Gibson is talking to Wallis at Scampton) - no dog was known to be on the base when the film was made, so the identity of the animal seen on film remains a mystery!
• The people:
  • Many of the people who worked on the film went on to even greater things, including:
    • Richard Todd (Guy Gibson): although "The Dam Busters" was probably his "finest hour", Richard went on to star in many other films including "D-Day: the Sixth of June" and "The Longest Day" (he had taken part in the real action in Normandy, and played the part of his real commanding officer in the film, with another actor playing Todd!) and he still does occasional guest appearances on TV such as "Silent Witness" and "Holby City"
    • Robert Shaw (Pulford, Gibson's Flight Engineer): became a big name in Hollywood, and is probably best remembered as Quint in Steven Spielberg's "Jaws" (he got eaten by the shark); died 1978
    • Bill Kerr (Harold "Micky" Martin): a regular on UK radio and TV in the 1960s, best known alongside Tony Hancock, he is still working in occasional guest roles in Australia
    • Nigel Stock (Spafford, Gibson's Bomb Aimer): well known on TV in the 1970s as "Owen M.D." and as Watson alongside Peter Cushing's Sherlock Holmes; died 1986
    • George Baker (David Maltby): regularly seen as Inspector Wexford in "The Ruth Rendell Mysteries" and in many other guest roles in film (notably James Bond films) and on TV
    • Richard Thorp (Henry Maudslay): since 1982, has played Alan Turner in TV series "Emmerdale"
    • Patrick McGoohan (uncredited, appears as a rather serious guard outside the briefing room in his first film role): later most famous as "The Prisoner" and as King Edward I in "Braveheart"
    • John Read (uncredited, special effects): became business partner of Gerry Anderson, and worked on many TV series including "Stingray", "Thunderbirds", "Captain Scarlet" and "Cloppa Castle"; died 2006
• Oops!:
  • In a number of shots of the Lancasters doing low flying practice (before the bombs are ready) ... the bombs are clearly visible beneath the aircraft!
  • When the practice with the range sight begins, we see close-ups of test bombs hitting a dummy target of two oil drums with a flag on top - but in the wide shots of the dam approach, this target is not seen.
  • As Shannon goes over the Eder, we hear the engines running up before he pushes the throttles forward.
  • In some of the long shots, the "Lancasters" in the background are actually post-war Avro Lincolns. The Wellington and Mosquitoes seen preparing for test drops are in post-war markings. Sharp eyes may spot a silver Canberra in the far distance of one shot.
  • The train washed away in the flood is running on the left track (as in the UK) - but German trains would normally run on the right track!
• Other movie and TV trivia related to The Dam Busters:
  • "The Dam Busters" was nominated for an Oscar for "Best Special Effects", and for BAFTAs for "Best British Film", "Best British Screenplay" and "Best Film from any Source" - it didn't win any of them.
  • "The Dam Busters" was first shown on TV in the UK on Sunday 30th May 1971 - two days after Wallis retired from the British Aircraft Corporation.
  • The Death Star trench sequence in the film "Star Wars" (1977) was inspired by "The Dam Busters".
  • Dick King-Smith's first novel "The Fox Busters" (1978) was also inspired by "The Dam Busters"; his later novel "The Sheep-Pig" was made into the film "Babe" and was a huge hit.
  • In the film "Pink Floyd: The Wall" (1982), a clip of "The Dam Busters" is seen on a TV in Pink's room during the "One Of My Turns" scene (Roger Waters' father was killed at Anzio during WW2).
  • Steenbergen (see below) means "stone mountain" so is not too dissimilar to "brick hill" - Paul Brickhill was the author of "The Dam Busters" book which was one of the primary sources for the film.
  • "The Dam Busters" came 11th in the 2005 Channel 4 viewer poll to find the "100 Greatest War Films" (it was beaten by "Bridge on the River Kwai", "Black Hawk Down", "Zulu", "A Bridge Too Far", "Platoon", "Full Metal Jacket", "Schindler's List", "The Great Escape", "Apocalypse Now" and "Saving Private Ryan" which came 1st).
  • "The Dam Busters" came 86th in the 2004 BFI's definitive list of of the top 100 most-seen films in the UK, with a cinema audience of 8.4 million.
  • "Mosquito Squadron" (1969), starring David McCallum and Charles Gray, features Mosquitoes dropping Highballs to destroy a German secret weapon site in a tunnel beneath a French chateau, and also to breach the chateau walls to release prisoners held there. The film plot is entirely fictitious, but the idea of using Highballs bounced over land to destroy tunnels and walls was actually tested, and some real test footage of drops at the Ashley Walk bombing range in the New Forest is seen in the film.
  • The theme from "The Dam Busters March" sounds remarkably similar to the melody line of "I'll Never Stop Loving You", sung by Doris Day in the film "Love Me or Leave Me" - both films were released in 1955, so this is surely a coincidence??? Listen to the tracks and see what you think! Among six Oscar nominations for the latter film was "Best Song" (it didn't win).
  • "Casualties of War", an episode from series 5 of ITV drama "Foyle's War" starring Michael Kitchen, features a fictitious group working on "bouncing bomb" research. The show featured a test rig with an Upkeep on it, computer-generated footage of test drops from a Lancaster, and an archive shot showing a real Lancaster accurately dropping its Upkeep onto the beach (Barnes Wallis is seen leaping about in the foreground). The formulae and diagrams on the blackboards in the research office were taken from Wallis' original notes. With a possible nod to history, in charge of the group was Prof. Townsend (the name of one of the original 617 Squadron pilots), and one of the characters who turns out to be a baddie is a Dane called Hans Lindemann (Prof. Lindemann / Lord Cherwell was Churchill's chief scientific adviser, and was consistently opposed to Wallis' ideas). The episode was first shown on TV in the UK on Sunday 18th April 2007.
  • Carling Black Label did a "Dam Busters" spoof advert and another one which also uses the "Dam Busters" music
• Other trivia related to 617 Squadron:
  • Guy Gibson appeared on "Desert Island Discs" in February 1944 - the theme music for the show was written by the composer who would later write "The Dam Busters March", Eric Coates. No recording of this show survives.
  • Guy Gibson's widow Eve died on the same date in 1988 as Sir Harold Martin, who was the third pilot to attack the Möhne Dam during the raid.
  • During his flight to the Ruhr for Operation Chastise, Guy Gibson passed virtually overhead of Steenbergen in the Netherlands, where he would be buried in 1944.
  • Nigger was unpopular on the station (being prone to urinating on aircrew's legs after drinking too much beer), and a rumour from the time says that he was not buried where he appeared to be, but his body was dumped in the woods, a rumour supported by the lack of bones found when the grave had to be moved post-war; it has also been suggested that the accident which killed him may not have been wholly accidental.
  • Doug Webb, who was a front gunner on the raid, later became a stills photographer in film and TV productions - his work includes the title sequence for "The Sweeney".

Send me an e-mail if you've spotted any other inaccuracies or inconsistencies in the film - thanks!

I have some information on the forthcoming remake of "The Dam Busters".

Go back to my main Barnes Wallis page