Not a single one, in fact. A bunch of two-ship and once a three-ship formation, mostly T3 Tankers and Liberty Freighters, with a 35.000 North Carolina Battleship as nice addition.
Playing the stock 1.5 german career in 1943 with only external views and map contact updates enabled (which I guess makes shooting somewhat easier) at a total of "80% realism", total patrol time about 2,5 months with two replenishments.
Thanks for commenting