What trick did Washington do at the Battle of Princeton?

Cornwallis sent troops to guard the Delaware River, expecting Washington to reverse the route he took for the midnight crossing on December 25. Instead, Washington left his campfires burning, muffled the wheels of his army's wagons and snuck around the side of the British camp.

c) troops march forward in close formation against newer, more accurate weapons

it increased the power of the king of england.