Excerpts from Books and Wikipedia
"In December 1776, Washington's army defeated German mercenaries at Trenton, New Jersey. [1001 Days] 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]