Banér, Johan(yo͞o`hän bänâr`), 1596–1641, Swedish field marshal in the Thirty Years WarThirty Years War,
1618–48, general European war fought mainly in Germany. General Character of the War
There were many territorial, dynastic, and religious issues that figured in the outbreak and conduct of the war.
..... Click the link for more information. . He served (1626–29) in Poland and Russia and accompanied (1630) Gustavus II of Sweden to Germany. At Gustavus's death (1632) and the major Swedish defeat at Nördlingen, he became the chief Swedish general in Germany. Banér reestablished Sweden's military prestige at Wittstock (1636), where he defeated the Saxon and imperial forces. After recovering (1638) Pomerania and Mecklenburg and winning (1639) a victory over the Saxons at Chemnitz, he penetrated (1639) into Bohemia but was forced to retreat.