OET interlinear HERO (JDG) 20:34

uW Translation Notes:

Note 1 topic: figures-of-speech / activepassive

בָּחוּר֙ מִ⁠כָּל־יִשְׂרָאֵ֔ל

(Some words not found in UHB: and=they_came from,before to,Gibeah ten_of thousand (a)_man picked from=all Yisrael and,the,battle fierce and,they not know that/for/because/then/when close to,them (the),calamity )

If your language does not use this passive form, you could express the idea in active form or in another way that is natural in your language. Alternate translation: [whom the Israelites had chosen as the best of all their soldiers]

Note 2 topic: figures-of-speech / metaphor

וְ⁠הַ⁠מִּלְחָמָ֖ה כָּבֵ֑דָה

(Some words not found in UHB: and=they_came from,before to,Gibeah ten_of thousand (a)_man picked from=all Yisrael and,the,battle fierce and,they not know that/for/because/then/when close to,them (the),calamity )

The author is speaking of the battle as if it were a heavy physical thing that was weighing down the soldiers or that was hard for them to carry. If it would be clearer in your language, you could state the meaning plainly. Alternate translation: [and the fighting was intense]

Note 3 topic: writing-pronouns

וְ⁠הֵם֙ לֹ֣א יָדְע֔וּ

and,they not know

The pronoun they refers to the Benjaminites. It may be helpful to clarify this for your readers. Alternate translation: [But the Benjaminites did not know]

Note 4 topic: figures-of-speech / idiom

כִּֽי־נֹגַ֥עַת עֲלֵי⁠הֶ֖ם הָ⁠רָעָֽה

(Some words not found in UHB: and=they_came from,before to,Gibeah ten_of thousand (a)_man picked from=all Yisrael and,the,battle fierce and,they not know that/for/because/then/when close to,them (the),calamity )

The author is using a common expression of his culture to mean that the Benjaminite soldiers were just about to experience great harm. If it would be helpful in your language, you could state the meaning plainly. Alternate translation: [that they were about to be destroyed]