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The Bomb, Medium Capacity, 22,000 lb (Grand Slam) was a 22,000 lb (10,000 kg) earthquake bomb used by RAF Bomber Command against German targets towards the end of the Second World War. The bomb was originally called Tallboy Large until the term Tallboy got into the press and the code name was replaced by "Grand Slam".
The site was used to develop a more effective air-raid shelter, built over five and a half months at a cost of £250,000.Once complete, the site became the first to be subjected to the devastating effect of Barnes Wallis's Grand Slam bomb, which was test-dropped on the site.
14 March: A railway viaduct at Bielefeld is destroyed by the first Grand Slam bomb to be dropped in combat by an Avro Lancaster. The attack by No. 617 Squadron RAF succeeds after 54 attacks using smaller bombs had failed. [47] 17 March: Adolf Hitler orders the SS to fire V-2 rockets at the Ludendorff Bridge during the Battle of Remagen. All 11 ...
The 381st Bombardment Group was awarded a Distinguished Unit Citation for its performance for bombing the Bremen shipyards accurately in spite of persistent Luftwaffe fighter attacks and extremely heavy and accurate flak. [22] [23] One B-17 had two bombs that failed to release and received a flak hit which caused them to explode (8 KIA, 2 POW).
Bombing of Berlin in World War II; in the first four months of the RAF campaign, the RAF lost around 1,000 aircraft; the USAAF joined the Berlin campaign from March 1944, with Mustang fighter support; the Luftwaffe fighter pilots were deeply alarmed by the numbers of the Mustangs; on 6 March 1944, the first large US raid drops 1600 tons of bombs from 600 bombers, with around 160 of the 800 ...
The bombers were escorted by ninety RAF North American Mustang fighters of 11 Group [3] The Lancasters attacking Valentin each carried a single large earthquake bomb – seven carried the 5 ton 'Tallboy', thirteen carried the 10 ton 'Grand Slam'. Two 'Grand Slam's hit the target and penetrated about half-way through the 15-foot (4.6 m) thick ...
The viaducts were attacked by 617 and 9 squadrons with Tallboys and the first Grand Slams. The Arnsberg viaduct withstood the attack but 100 m (330 ft) of the Bielefeld viaduct collapsed through the 'earthquake effect' of the Grand Slams and Tallboys. [33] 15 March 1945 – Arnsberg viaduct Arnsberg viaduct was attacked again by 9 Squadron.
Led by 617 Squadron, the Group often engaged in special missions, using new weapons, such as Barnes Wallis's bouncing bombs, and two type of "earthquake bomb": Tallboy and Grand Slam. 1939 – 1945. From 11 September 1939 until 22 November 1940, Air Vice Marshal (AVM) Arthur Harris was in charge.