Vistula Lagoon Vistula Lagoon The Vistula Lagoon (; or "Kaliningradskiy Zaliv"; ; ) is a brackish water lagoon on the Baltic Sea roughly 56 miles (90 km) long, 6 to 15 miles (10 to 19 km) wide, and up to 17 feet (5 m) deep, separated from Gdańsk Bay by the Vistula Spit. It is now known as the Vistula Bay or Vistula Gulf. The modern German name, "Frisches Haff", is derived from an earlier form, "Friesisches Haff". The lagoon is a mouth of a few branches of the Vistula River, notably the Nogat, and the Pregolya River. It is connected to
Battle of Vistula Lagoon The cities' ships on the other hand, came out of the river into the lagoon and formed themselves into a crescent formation. Despite having fewer ships, the Prussians (as more experienced sailors) were victorious. They gained control of the Vistula. Among the captured knights was Hans Hetzel, the komtur of Memel (Klaipėda). As a result of the battle, Mewe capitulated to Polish forces in 1464, and the Teutonic Navy was eliminated as a viable force. A number of mercenaries in the Order's service, including Bernard Szumborski, left the Teutonic side and signed an independent peace treaty with the Polish king,