 Whilst he's gone, Godfrey answers the phone and writes down the last 3 digits, but puts them in the wrong place so the reference reads 641937.Arriving at the barn a few miles from their destination, Jones' van breaks down, so Mainwaring leaves Jones and Godfrey to guard the vehicles (and also to keep Jones away from the live ammunition) whilst the rest march on.When Jones rings the exercise HQ to inform them the platoon has arrived, he is told he has got the wrong reference, which turns out to be the target for some 25-pounder artillery guns.