>>/49439/
I believe I found the Warspite vs Shütze incident in Churchill's book (The Second World War Vol. 1; Rosetta Books, 2002 /1948/)

This is how it looked like from the British side:
By the morning of April 10, the Warspite had joined the Commander-in-Chief, who was proceeding towards Narvik. [...] Admiral Whitworth shifted his flag to the Warspite at sea, and at noon on the thirteenth he entered the fiord escorted by nine destroyers and by dive-bombers from the Furious. There were no minefields; but a U-boat was driven off by the destroyers...
That's it. Then he goes on writing about an attack against German destroyers at Narvik.