The correct answer to this open question is the following.
If you are referring to the first major victory of the Patriots led by General George Washinton in the Revolutionary War, then we are talking about his victory in the Battle of Trenton on December 26, 1776.
This was a great victory that uplifted the morale of the troops and General George Washington, who was the leader of the Continental Army.
After this victory in Trenton, New Jersey, General Washington got another important win in Princeton, New Jersey. Both victories sent the clear message that the Continental Army had the elements and the strategy to be a fierce opponent to the British Army.