Why does the Torah describe Hashem as 'Keil Gadol ve'Nora', omitting 'Gibor'?
Ba'al ha'Turim: "Gadol" represents Avraham,
and "Nora", Ya'akov,
both of whom fought battles (against the four kings and against Lavan and Eisav, respectively).
And on whose merit Hashem would fight on behalf of Yisrael against the Cana'anim.