Saratoga

Battle of Saratoga (September 19 and October 7,1777).         
This battle is known outside the US as the American war of independence.
The first battle, on September 19, began when Burgoyne moved some of his troops in an attempt to flank the entrenched American position on Bemis Heights. Benedict Arnold , anticipating the maneuver, placed significant forces in his way.
Those few troops made a big difference in the big battles, because they lost many soldiers in those small battles.