Sweden does have a legend about Blenda and her army of 500 women.
The men were away in Norway, and the Geats took the opportunity to invade from Denmark.
Blenda called the women to war. They went to the Geats and said, oh, you are real men. Will you come feast with us?
The women got the Geats and sleeping and then they killed them, and were handsomely rewarded by the returning king.
Like Judith and Jael, only en masse.
Beowulf was a Geat, IIRC.