In case it had passed you by, October 14th 1939 is when Gunther Prien on U47 sank the elderly battleship Royal Oak in Scapa Flow.
I tried the re-enactment on SH3 Single Missions, but got "zapped" very early in my approach.
For more detail of Herr Prien's and U47's career see:
http://en.wikipedia.org/wiki/German_submarine_U-47_(1938)