We don’t say ata gibor, and then speak about Napoleon and ascribe it to Hashem- that, while true, is not the point of that praise.
yes it is the point
Atah Gibor, of course it is understood Hashem works through intermediaries. what do you think Atah Gibor means? Yam Suf? the winds? returning souls? the movements of all the celestial bodies? the birth of stars?
all through intermediaries, just like napoleon or big trucks or the movement of your muscles, no different
the point of this praise is that You and only You are the source of ALL Gevurah whether it is clear like Yam Suf or whether it is hidden, like napoleon