The "Ten Crucial Days" were the days from December 25, 1776 to January 3, 1777, when several decisive battles, namely the battles of Trenton, Assunpink Creek and Princeton, were fought between the Continental Army under George Washington and the British army, mostly under Charles Cornwallis. Washington badly needed a victory to prove his army's hope of winning and thus boost morale. It is considered as one of the most significant military offensives in history. According to George Otto Trevelyan: "It may be doubted whether so small a number of men ever employed so short a space of time with greater and more lasting effects upon the history of the world." Frederick the Great called them "“the most brilliant in the world’s history.”" President Coolidge called them "“a military exploit of unparalleled brilliancy.""