en_tn/jdg/11/36.md

has taken vengeance for you against your enemies, the Ammonites

Yahweh has taken vengence for him by defeating his enemies. The meaning of this can be made explicit. AT: "has taken vengeance for you against your enemies, the Ammonites, by defeating them" (See: rc://en/ta/man/translate/figs-explicit)

Let this promise be kept for me

This can be stated in an active form. AT: "Keep this promise for me" or "Keep this promise concerning me" (See: rc://en/ta/man/translate/figs-activepassive)

grieve over my virginity

"weep because I am a virgin" or "cry because I will never be married"