In 1630, the Swedish (and Finnish) armies marched into Central Europe, as Sweden had decided to take part in the great struggle between Protestant and Catholic forces in Germany, known as the Thirty Years' War.
I 1630 marcherede svenske (og finske) hære ind i Centraleuropa, idet Sverige havde besluttet at involvere sig i den store kamp mellem protestanter og katolikker i Tyskland kendt som Trediveårskrigen.