All submarines were dispatched for their operational zones in the southern Baltic to take part in the Worek Plan, an attempt to defend the Polish coast against possible German landings.

All the remaining surface vessels were to be dispatched from the naval base in Gdynia to Hel Peninsula, from where they were to start the so-called Operation Rurka.

The plan was to lay a naval mine barrier between Hel Peninsula and Danzig to prevent any enemy ship from entering the area.

[1] While traversing Danzig Bay, the flotilla was surprised by a group of 33 German warplanes, mostly Junkers Ju 87B Stuka dive bombers.

Stefan Kwiatkowski, was killed by German machine gun fire, 29 of his men were wounded, and his ship's rudder was jammed.

Stefan de Walden, spotted two German destroyers, and later a ship misidentified as a light cruiser, but did not attack, not wanting to compromise the operation.