sentences:  Besides providing tactical intelligence, Knowlton's Rangers, outfitted as a regiment of light infantry, took part in several battles of the American Revolutionary War.That is why Knowlton's Rangers are considered the first organized American elite force, a predecessor to modern special forces units such as Army Rangers, Delta Force, and other special operations units.On September 16, 1776, Knowlton's Rangers were scouting in advance of Washington's Army at Harlem Heights, New York.