In the beginning, the British chased the Americans from their settlement in New York back across the Delaware River.
After that, Washington is shown helping and caring for his soldiers. Something that not many other generals did.
In this scene, Washington is shown arguing with his other generals about what the militia will do next. They finally decide that they will attack the Hessians, the mercenaries for the British, in Trenton, New Jersey, on the early morning of December 26th.