Excerpts from Books and Wikipedia
"The bold maneuvers of General Washington at Trenton and Princeton within just 10 days turned the tide of the war. "The Revolutionary War continued for several more years, until it finally ended with Washington's victory over Cornwallis at Yorktown in 1781. But the true turning point was the twin victories of Trenton and Princeton. These came at the very darkest moment for the Revolution, at a time when support for it was faltering and everything seemed to be turning against the young republic." [Aldrete: Decisive Battles] "Since he had crafted the strategy and led his men to glory, the stunning victory belonged to Washington lock, stock, and barrel. The American triumph was accomplished in less than an hour.'It may be doubted,' wrote George Trevelyan, '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.'” [Chernow: Washington, p. 276]