Battle of Vistula Lagoon and the Poles and the Prussian Confederation seized the initiative in the Thirteen Years' War. The war itself ended with the signing of the Second Peace of Toruń in 1466 and the incorporation of Royal Prussia, including Gdańsk and Elbląg into Poland. The battle was first described by the contemporary Polish chronicler Jan Długosz. The battle is described in several works of historical fiction, among them "Znak Salamandry" ("Sign of the Salamander") by Jerzy Piechowski, "Skruszona Potęga" ("A Crumbled Power") by Kazimierz Traciewicz and "Bałtyckie Orły" ("Eagles of the Baltic") by Józef Wójcicki. Battle of Vistula Lagoon The Battle of
Vistula Lagoon Century as Estmere. It is an Anglo-Saxon translation of Old Prussian name for the lagoon - *Aīstinmari (modern Lithuanian - Aistmarės) derived from (OP - Old Prussian) Aistei - "Ests", (LAT - Latin)"Aestii" etc. and (OP) *mari - "lagoon (a body of water cut off from a larger body by a reef of sand), fresh water bay". The Ests were Baltic people who since 9th Century became called in some historical sources (first time by Bavarian Geographer) Bruzi, Pruzzen, Pruteni etc. - Old Prussians. So the oldest known meaning of the name of Vistula Lagoon was "The lagoon or sea