OET interlinear HERO (JDG) 11:9

uW Translation Notes:

Note 1 topic: grammar-connect-condition-hypothetical

אִם־מְשִׁיבִ֨ים אַתֶּ֤ם אוֹתִ⁠י֙ לְ⁠הִלָּחֵם֙ בִּ⁠בְנֵ֣י עַמּ֔וֹן וְ⁠נָתַ֧ן יְהוָ֛ה אוֹתָ֖⁠ם לְ⁠פָנָ֑⁠י אָנֹכִ֕י אֶהְיֶ֥ה לָ⁠כֶ֖ם לְ⁠רֹֽאשׁ

if (Some words not found in UHB: and=he/it_said Yiftāḩ/(Jephthah) to/towards elders_of Gilˊād if take_~_back you(pl) ,me to,fight against,the_people_of ˊAmmōn and=he/it_gave YHWH ,them before,,me I be to/for=you(pl) (into),chief )

This could mean: (1) that Jephthah is restating the condition that the elders described in order to confirm it. Your language may have an expression that you can use to indicate this. Alternate translation: [Now let me get this straight: If you have brought me back to fight with the sons of Ammon and Yahweh gives them over to my face, I will be the head for you]; (2) that Jephthah is asking the elders to confirm the description they have described. Alternate translation: [If you have brought me back to fight with the sons of Ammon and Yahweh gives them over to my face, will I really be the head for you?]

Note 2 topic: figures-of-speech / idiom

וְ⁠נָתַ֧ן יְהוָ֛ה אוֹתָ֖⁠ם לְ⁠פָנָ֑⁠י

and=he/it_gave YHWH ,them before,,me

Jephthah is using this expression to mean that Yahweh would enable him to defeat the Ammonites. (Gideon used a very similar expression in 8:7 when he spoke of Yahweh “giving” Zebah and Zalmunna into his “hand.”) If it would be helpful in your language, you could state the meaning plainly. Alternate translation: [and Yahweh enables me to defeat them]

Note 3 topic: figures-of-speech / metaphor

לָ⁠כֶ֖ם לְ⁠רֹֽאשׁ

to/for=you(pl) (into),chief

See how you translated the same term in the previous verse. Alternate translation: [your ruler]