What does Numbers 25:18 mean?

They treated you like enemies, tricking you with their schemes at Peor and through their leader’s daughter, who got you tangled up in that mess at Peor. She died in the plague that hit because of what happened. Numbers 25:18 - Modern Text Bible

(This verse is explaining why the Israelites should see the Midianites as adversaries: they deliberately led Israel into sin at Peor, using deception and seduction, which resulted in a deadly plague.)