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Gustavus at first stayed out of the Thirty Years War, which had begun in 1618. However, his resumption (1621) of the intermittent warfare between the Swedish and Polish branches of the house of Vasa led to his entry into that vast conflict. His primary objects in invading Poland were to consolidate Swedish hegemony over the Baltic by acquiring Polish Livonia and to reduce the threat posed by the Catholic Sigismund III of Poland to Swedish Protestantism.
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