Attacking ports at night

[drronnie]

As I am still in the learn and trying phase I feel most comfortable attacking ship in enemy ports at night time and then slowly escaping the destroyers by traveling in periscope depth with the periscopes pulled down. Works quite well unless I surface too quickly. The downside of this is that I can only operate at night and it will take me too long to get reknown points.

is there any better way anyone can recommend me to do.