וַיֹּֽאמְר֨וּ זִקְנֵ֣י הָעֵדָ֔ה מַה־נַּעֲשֶׂ֥ה לַנּוֹתָרִ֖ים לְנָשִׁ֑ים כִּֽי־נִשְׁמְדָ֥ה מִבִּנְיָמִ֖ן אִשָּֽׁה׃
Les anciens de la communauté dirent: "Comment pourvoirons-nous de femmes ceux qui restent encore, toute femme en Benjamin ayant été exterminée?"
Rabbeinu Bahya
The words להעלות נר, are sort of a headline. The word נר means “lamps” (pl.) just as when Yaakov told Esau that he had acquired שור וחמור (Genesis 32,6) he did not mean that he had acquired only one of each, but that he had made acquisitions of these respective species of domestic animals. We find a similar use of the “singular” אשה, in Judges 21,16, where the words כי נשמדה מבנימין אשה do not mean that “a woman of the tribe of Benjamin had been killed,” but that ”all the women of Benjamin had been destroyed.”