It is worth mentioning that the Hessians did not celebrate Christmas by decorating trees and opening presents; they celebrated by getting mind-splittingly drunk. General Washington kept his troops in line and took full advantage of the enemy's dissolution.
Merry Christmas to all, and to all a good night.
His troops didn't get to Trenton until 8:00 but the Hessians were still sleeping it off. Any other day and he couldn't have pulled it off.