With the string of successes in low level marking Cochrane took Cheshire to see Harris to discuss their marking technique, request the use of Mosquito aircraft, and ask that 5 Group be allowed to mark for themselves against targets in Germany. Harris heard what they had to say, and though Cheshire's squadron had a good track record against lightly defended targets in France, it was likely going to be another story if they were to attempt such a technique against one of the heavily defended targets in Germany. There was a target in Germany that Harris felt he had yet to hit adequately – Munich. Said Harris "Mark me Munich and I will give you the Mosquitos. Miss Munich and you will lose the Mosquitos." They would be allowed four Mosquito aircraft on loan from PFF. Using these four and the rest of 617 in Lancasters as back up, they were to mark the rail yard at Munich for 5 Group, who were tasked with the yard's destruction.