Then, as he examined the plot, a question formed in Roberts’ mind. If the U-boats were firing from outside the perimeter of the convoy, how had Annavore, which was in the centre of the convoy, been sunk? Might it be possible, he wondered, that the U-boat had attacked the ship from inside the columns of the convoy? There was, he reasoned, a simple way to prove his theory. ‘Hold everything,’ Roberts told his staff, as he rushed into his office to make a phone call. Roberts picked up the receiver and asked the operator to put him through to the Flag Officer Submarines in London, hoping to speak
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