Darn the luck! Wish I'd noticed this earlier, but I figured any French ship flying the tricolor and in the midst of an escorted British convoy could be considered hostile. I had my best action against a convoy yet and sank one tanker, two warships and seven cargo vessels south of Portsmouth at the lower end of the English Channel. I was occasionally interrupted by a pesky Elco boat, but still managed to steal enough surface time to load my external reserve eels and exhaust them into the aforementioned shipping. I had only one green sunken ship icon on the map and that was the last one I attacked. Of course I was perplexed when it was clearly flying a French flag, but the after-action report said I managed to sink two neutrals. I'll bet the other one was French as well, though I don't recall for sure. Live and learn.