Illustrious in Scapa Flow. Prior to the actual attack a DD detected me and (of course) attacked me with 3 of his colleagues. They depthcharged me for several hours in very shallow waters and one DD even rammed me. But during the fight I was able to sink one of them and I managed to stay undetected long enough after that. So after the remaining DDs went home for some ham & eggs I spotted the carrier only about 1 km away...
