
If you look at the picture carefully, look at the oarsman on the other side near the oarsman in front of the boat, and someone said that it would have been a black man named Prince Whipple. Below are several sites that explain this picture:
http://www.npr.org/programs/morning/features/patc/georgewashington
http://www.americanrevolution.org/delxone.html
http://en.wikipedia.org/wiki/Washington_Crossing_the_Delaware
You will find it interesting that this painting was done in Dusseldorf, Germany in 1851.
I will do some more research on reading another question about who was the famous person who accidentally set the forest on fire (300 acres) when cooking a fish. That would be one of the "Did you know that...?" questions.