TT #283 · Parashas Shoftim · Seventh Aliyah · Passuk 20:04
For the Eternal your God is the One who goes with you, to fight for you against your enemies, to save you.
Torah Temimah points to Sifrei Devarim 192.
TT lemma: לְהִלָּחֵם לָכֶם עִם אֹיְבֵיכֶם לְהוֹשִׁיעַ אֶתְכֶם.
English: ‘To fight for you against your enemies, to save you’ – He fights, and you do not fight.
Derash on Divine agency in war (Sifrei) — the people are saved by Hashem’s action more than by their own.
Hashem Himself fights for Yisrael; the army’s role is secondary to the Divine deliverance.