On December 25, 1776 General George Washington and his army crossed the Delaware River as the first move in a surprise attack against the Hessian forces in Trenton, New Jersey.
For more information regarding the above painting copied via wikipedia public domain please see
For further reading:
"Washington's Crossing of the Delaware River" on Wikipedia,
"Washington Crosses the Delaware" at EyeWitness to History.com,
and David Hackewtt Fischer's book Washington's Crossing