Though delighted with the opportunity, Harris had selected about the most difficult target for Cheshire to reach. It was a great distance to fly, and would be at the limit of the Mosquito's range. Their course had to be direct, with no flying around well defended targets. Even so, they would be cutting it pretty thin. With the fuel range limit of the Mosquito they would have 3 minutes time over the target, and 15 minutes of fuel left when they got back. After he explained the mission to the four navigators who would be in the Mosquitos, there was general disbelief. The common belief was if they were lucky enough to survive the mission they would most likely be spending the rest of the war in a Luftwaffe prison camp. The Mosquitos moved forward to RAF Manston, the nearest airfield for the mission. On the night of 24/25 April, four Mosquitos of 617 set out to mark the Munich rail yard for 5 Group.