The Polish Navy
The pre-war Polish Navy, was not a big one and not strong enough to defend the Polish coast from a larger Navy like the German Kriegsmarine. The Navy consisted of 4 destroyers (Burza, Grom, Wicher and Blyskawica), the minelayer Gryf, 5 submarines (Orzel, Sep, Zbik, Wilk and Rys) and a number of smaller vessels. 3 destroyers were sent to Britain just before the war, to be saved from German hands. Thus in the Baltic Sea only 2 big surface vessels and 5 submarines stayed behind to defend the Polish coast.
Read more about the Polish Navy in WWII here.
Ships of the Polish Navy
39 warships of 10 types.
According to our files the Polish Navy lost 12 warships during WWII (30.77%). See them all here.