Yes, I remember that well, it was the same exercise that some Marders of our erstwhile Enemies tried to cross the forementioned stream and as a result were knocked out. On enquiring why they were knocked out the were informed that as a protection to our flank we had laid A/Tk Mines in the stream bed after we had crossed. The Germans did not believe the Umpire, so I led them to the stream, moved a side the gravel and exposed 6-8 dummy bar mines that the veh carried, that I had laid on the bed of the stream. The look on the Germans Faces was a peach.