>This happened on Christmas Eve
—
Wrong.
This is the second time I've seen this date posted.
Washington et al crossed The Delaware (Dec 25-26).
Washington's force attacked the Hessians on the morning of (Dec 26) after crossing the river the night of the 25th - 26th.
https://www.history.com/this-day-in-history/washington-crosses-the-delaware
https://www.mountvernon.org/library/digitalhistory/digital-encyclopedia/article/crossing-of-the-delaware/