My favorite boat.

Had my first successful career in the IIA: U-14. Sept 1 1939 to Feb 21, 1940
I was able to sink >15000GRT in 6 patrols. 1 C class destroyer also. Since I have SH3 commander, I was retired before my 7th patrol.
Only problem with the IIA is the lack of range: could only patrol for a few days before the fuel ran out...but torpedoes (only 5)would run out well before that...