An undated photo of Ms. Oversteegen. (Courtesy of National Hannie Schaft Foundation)

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In perhaps their most daring act, they seduced their targets in taverns or bars, asked if they wanted to “go for a stroll” in the forest — and “liquidated” them, as Ms. Oversteegen put it, with a pull of the trigger.

“We had to do it,” she told one interviewer. “t was a necessary evil, killing those who betrayed the good people.” When asked how many people she had killed or helped kill, she demurred: “One should not ask a soldier any of that.

She and her family lived on a barge. Before the war started in the Netherlands, the Oversteegen family hid people from Lithuania in the hold of their ship.

After the divorce of her parents, Oversteegen was raised by her mother. She moved from the barge to a small apartment. Her mother later remarried and gave birth to her half-brother. The family lived in poverty.

Oversteegen, her sister, and friend Hannie Schaft worked to sabotage the Nazi military presence in the Netherlands.They used dynamite to disable bridges and railroad tracks. They also smuggled Jewish children out of the country or helped them escape concentration camps.

The Oversteegens and Schaft also killed German soldiers, with Freddie being the first of the girls to kill a soldier by shooting him while riding her bicycle. They also lured soldiers to the woods under the pretense of a romantic overture and then killed them. Oversteegen would approach the soldiers in taverns and bars and ask them to "go for a stroll" in the forest.