It's Gdynia.

Many people don't know this little fact, but the 1st shot of WWII was fired on Westerplatte where a small Polish garison defended the little inlet for 7 days against all odds. They were bombarded from the sea, air and attacked by some of the best that Wermacht and SS units had. It's located just north of the city and I believe there is a memorial and some of the old buildings left and now serve as a museum.

Anyway, here is a good place to read about the tri-cities and the surrounding areas.

http://guide.trojmiasto.pl/