Congratulations on your first post and welcome.
That is more than likely. A Swedish fort/fortified trading colony was established in Delaware in 1638. Twenty years into the 30 Year War.
The place was taken over by the Dutch in 1655, followed by the English in 1664.
By 1681 the colony had expanded and formed an autonomous area called Three Lower Counties. Simply because the Swedish, Finn and Dutch settlers were different religiously and culturally from the surrounding Quaker colonies.
Info from The Forts of Colonial North America by Rene Chartrand, page 41.