I am playing as Germany, it is Januar 1940, and I have sunk at least 4 BBs, 1 BC, 1 CV, 1 CVL, 5 CA and many CLs and DDs; most capital ships were French, most screens British.
research: all the techs expected in 1940, but nothing more
production: all event submarines + running continuosly 4 lines of type VII and 2 lines of type IX since I researched them (sometime in 1937)
fleet composition: 3 fleets: long range (between 8-10), med range (12) and short range (20s)
missions: Always sent them to raid convoys, and they have done that relatively well, but realistically; no more than 10 to 12 ships sunk per patrol usually sinking 1-2 ships per battle
research: all the techs expected in 1940, but nothing more
production: all event submarines + running continuosly 4 lines of type VII and 2 lines of type IX since I researched them (sometime in 1937)
fleet composition: 3 fleets: long range (between 8-10), med range (12) and short range (20s)
missions: Always sent them to raid convoys, and they have done that relatively well, but realistically; no more than 10 to 12 ships sunk per patrol usually sinking 1-2 ships per battle