::What’s the significance of Trenton....?::
~~~~~~
Don’t know the signifcance in this context, but Trenton is where Washington headed after crossing the Delaware. He defeated the Hessian troops there.
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.