Washington's army was outnumbered 4 to 1 by the British at the start of the Revolutionary War. Through clever tactics like ferrying troops across the Delaware River on Christmas night to surprise Hessian forces, Washington was able to boost American morale after early defeats and keep his army intact. Later key events included the British surrender at Saratoga after several failed campaigns, bringing France into the war as an American ally, and the difficult winter the Continental Army endured at Valley Forge with the help of Baron von Steuben's training.