Monmouth was not a victory but a stalemate. It should have been a victory, but Charles Lee's attack was repulsed effectively by the British, thus permitting the long British column to safely make its way to New York. Washington dismissed Lee from the battlefield with a few choice words.
Y'know, as absolutely courtly as Washington usually was, I've always had a hunch that he could raise three-cornered h*** with someone and not even raise his voice.
I should imagine that Mister Lee's ears were burning for a month after those "few choice words".