Adam Clarke on Psalms 78:65

Then the Lord awaked - He seemed as if he had totally disregarded what was done to his people, and the reproach that seemed to fall on himself and his worship by the capture of the ark.

Like a mighty man - כגבור kegibbor, like a hero that shouteth by reason of wine. One who, going forth to meet his enemy, having taken a sufficiency of wine to refresh himself, and become a proper stimulus to his animal spirits shouts - gives the war-signal for the onset; impatient to meet the foe, and sure of victory. The idea is not taken from the case of a drunken man. A person in such a state would be very unfit to meet his enemy, and could have little prospect of conquest.