There’s a bible story about Jacob’s daughter Dinah.
Jacob and his family, including his wife Leah, Dinah and her many brothers were encamped outside the Canaanite town of Shechem.
Dinah went into town to check it out and make friends with the local girls. Once there, she was abducted and raped by the prince of Shechem.
His father, the King approached Jacob to arrange a marriage as compensation for the defilement.
He also suggested that the Jewish girls should marry the town’s boys and the Jewish boys should marry the town’s girls.
Jacob’s sons agreed on the stipulation that all the males of the town be circumcised first, in essence making them Jews.
The king agreed and they were all circumcised.
On the third day of their recovery two of Jacob’s sons, Levi and Shimon sneaked into town and killed all the males.
On the surface it appears that they plotted to kill all the males as payback from the get go and waited until they were incapacitated to do so.
A great bible scholar from the middle ages said no, it’s not the case.
They made the males get circumcised, not to render them helpless, but once they were converted to Jews, when they were killed, none of the other Canaanites would care.