My picture oil: The naval Battle of Oliva, also Battle of Oliwa or Battle of Gdańsk Roadstead, took place on 28 November 1627 during the Polish-Swedish War outside Danzig (Gdansk) harbour near Oliva (Oliwa), a village outside of Danzig. It was the biggest and the last naval battle of the Polish royal navy, but it brought a victory over a Swedish squadron.

The Swedes had a strong navy, and they maintained a blockade of the Baltic shore, especially Danzig harbour. On 28 November 1627, the Polish fleet engaged the Swedish blockading squadron. The Polish ships were more numerous, but only four galleons had full combat value, the rest were smaller ships. The Swedes had a longer tradition of seamanship, while the Polish navy was newly formed.

The Polish fleet of ten ships, commanded by admiral Arend Dickmann in the galleon Sankt Georg (Święty Jerzy), was anchored at Danzig roadstead, while the Swedish squadron of six ships sailed from the direction of the Hel Peninsula. The Poles weighed anchor and rushed towards the Swedes, who did not expect such reaction. The battle soon split into two encounters.

Hi, maciej. Happy to see you after long time no see.
I realized for the first time they were fighting on the sea during Sweden-Poland Wars in 17th century.
By the way, why did you paint this picture of disastrous battle at this moment?

スェーデンとポーランドが17世紀頃王位継承権を巡って戦争したことがるのは知っていましたが、「オりヴァの海戦」というのがあったことは初めて知りました。
ウィキペディアによれば：
「スウェーデン・ポーランド戦争とは、1621年から1629年まで続いた、ポーランド王国とスウェーデン王国の、スウェーデン王位継承権をめぐる「ヴァーサ王朝」同士の戦争。最も広義には、1598年以降の係争も含み、1629年のアルトマルクの和議によって、両国の戦争は一区切りとなった。」とあります。

Thank you very much Masa!