Battle of Oliwa
The Battle of Oliwa, also known as the Battle of Oliva, or the Battle of Gdańsk Roadstead, was a naval battle that took place on 28 November 1627 slightly north of the port of Danzig off the coast of the village of Oliva, during the Polish–Swedish War. It was the largest naval engagement ever fought by the Polish–Lithuanian Commonwealth Navy, and resulted in the defeat of a Swedish squadron led by Niels Stiernsköld that was conducting a blockade of the harbour of Danzig. The Poles sailed out of the Danzig harbour and engaged the Swedish squadron, capturing the Swedish flagship and sinking another Swedish warship.