The Benjamites did as instructed and carried away the number of women they needed from the dancers they caught. They went back to their own inheritance, rebuilt their cities, and settled in them.
We have here the method that was taken to provide the 200 Benjamites that remained with wives. And, though the tribe was reduced to a small number, they were only in care to provide each man with one wife, not with more under pretence of multiplying them the faster.
Commenting on Judges 21:16-25
And the children of Benjamin did so,.... Went and laid wait in the vineyards, and when the daughters of Shiloh came out to dance, they rushed upon them: and took them wives according to their number; two hundred of them, each man a wife, and no more; for though polygamy was in use in those times, and if at any time necessary, and could be...
Jdg 21:23 The Benjaminites adopted this advice. They took to themselves wives according to their number, i.e., two hundred (according to Jdg 21:12, compared with Jdg 20:47), whom they caught from the dancing daughters of Shiloh, and returned with them into their inheritance, where they rebuilt the towns that had been reduced to ashes, and dwelt therein.