On June 13th, just one week after D-Day the first of many V-1 Doodlebugs landed on London. British High Command already had a list of production sites but raids had been ineffective due to their locations underground and in tunnels. No 617 Sq and it’s Tallboys were now tasked with the job. Raids on June 19th, 21st, 22nd, and 24th to Watten and Wizernes effectively put an end to production at these sites,and a number of launch sites were also put out of action. With No 617 Squadron now mostly engaged in day light raids, Cheshire asked for a new aircraft to carry out marking. The first Mustang III’s had arrived from America under the lend lease program. Two arrived at Woodhall Spa on June 21st still in their packing crates, these were taken into the hanger and assembled. At this time attachment points were fitted under the wings for the marking ordinance. Cheshire was keen to try the new machines as soon as possible. Ground crews managed to have HB839 ready for a raid on June 25th, to the V-1 storage depot at Siracourt, with the aircraft completed only an hour before the unit left on the mission. Cheshire had no time for a ‘practice’ flight. So, with most of the squadron airborne, climbing into the cockpit he started the engine and so began Cheshire’s most remarkable flight. He took off on the aircrafts initial air test and first operational flight in one. This was Cheshires maiden flight in a Mustang, for the first time in years the legendary bomber pilot was flying solo, having to fly and navigate for himself. However he reached the target and dropped from 3,000 to 500 ft and dropped his markers. These were backed up by Shannon and Fawke in their Mosquitos, the squadron bombed well and the complex was out of action. With a final look at the target Cheshire turned for home, all he had to do now was work out how you land a Mustang. Poor weather saw several operations cancelled at the end of June, but on July 4th a clear spell saw a very successful attack on the V-1 storage site at Creil near Paris. The 6th July was the beginning of one of those ‘strange’ events of WWII that are not often spoken of. 550+ aircraft including 617 sq attacked five V-sites, No 617 Sq attacking the site at Mimoyeques. The site housed the V-3 ‘Supergun’, housed underground and covered by a concrete slab 98ft wide and 18ft thick. The site had been previously bombed 6 times by the USAAF and once by the RAF with no effect. Three near misses and one direct hit by Tallboys caused the collapse of the housing, unseen was the damage to the underground infra-structure, caused by the earthquake effect of the near misses, which was so severe the Germans abandoned the site. However this was unknown to the Allies, the USAAF mounted two further raids, the second being the bizarre ' Project Anvil '. A radio controlled B-24 packed with explosives would be piloted to the target at which point the pilot and flight engineer would bail out and the plane would be remotely guided to the target. The aircraft was piloted by Lt Joseph Kennedy elder brother of future President John F. However before Kennedy was able to set the B-24 on course and bail out, the aircraft exploded killing both Kennedy and his engineer. The Mimoyeques raid was Cheshires 100th operational flight and completed four tours. The following morning he was taken aside by Cochrane and told he had done enough and was being removed from operational flying. Despite Cheshires protests Cochrane would not be swayed, at the same time the last 3 original Dambuster pilots Les Munro, Dave Shannon and Joe McCarthy were also ‘rested’ they had each been on continuous ops for more than 2 years. Cheshire was replaced as CO by Wg Cdr James ‘Willie’ Tate, another very experienced and respected leader.