After the German allies of Sweden were forced to seek terms with the Holy Roman Empire, the French first minister, Cardinal Richelieu, declared war on Spain because French territory was surrounded by Habsburg territories.
Setelah sekutu-sekutu Swedia di Jerman terpaksa berdamai dengan Kekaisaran Romawi Suci, menteri Pertama Prancis, Cardinal Richelieu, menyatakan perang terhadap Spanyol karena wilayah Prancis dikelilingi oleh wilayah Habsburg.