The Siege of Danzig took place between 1655 and 1660 when a Swedish force tried to capture this important Baltic Sea port city from the Polish-Lithuanian Commonwealth during the Second Northern War. After 5 years of fighting around Danzig (Gdańsk), the Swedish force which has made little ground surrendered.
- Swedish naval forces blocked Danzig's harbor - trade was suspended.
- Swedish land forces capture the fortress Danziger Haupt (Głowa Gdańska, Danzig Head) - very important water gate on Vistula River
- 1656, July - Dutch naval forces comes to Gdańsk Bay and unblock Danzig's harbor.
- 1656, September - Treaty of Elbing: siege lifted due to Dutch intervention
- 1659, 26 October - Poles defeated the Swedes in a skirmish near Danziger Haupt.
- 1659, 22 December - Swedish garrison of the fortress Danziger Haupt capitulated.
- 1660, May - Treaty of Oliva was signed. End of war.
Danzig all of that time was unconquered and remain loyal to Polish-Lithuanian Commonwealth.
- "Dzieje Gdańska", Edmund Cieślak, Czesław Biernat. Wydawnictwo Morskie Gdańsk, 1969
Coordinates: 54°22′00″N 18°38′00″E / 54.366667°N 18.633333°E