Off the coast of Portugal in very bad weather in mid 1941. Got a sound contact and along comes a huge large merchant out of the gloom and rain. I was at periscope depth, desperately trying to see the flag. Took a chance, without seeing the flag, and hit him with two eels-perfect. However my crew did not cheer-they were dead silent.
Finally got a view of the flag at 300m-big old red meatball on a white field.
She sank-score one for me-a German sinking a Jap.