the battle of Chancellorsville in the American Civil War. background: union (northern) army is at approx. 110,000 men strong. confederates (southern) army is maybe 80,000 strong. the union marches into Virginia, into a thick wooded area called the Wilderness. they march in, set up camp, and go to bed for the night. Gen. Lee (southern commander) decides to divide his army in half, keeping one half with him in front of the Union army, and sending the other half, under the command of Gen. Thomas J. "Stonewall" Jackson
, to attack the Union's left flank. well, the attack goes perfectly, Jackson pops up on the Union left flank and routes a Union army corps (the 11th). however, Jackson is mistakenly (and ultimately fatally) shot by his own troops.
the battle of the cowpens in the American Revolutionary War.
the battle of Lake Erie in the war of 1812
the Peninsular Campaign of the American Civil War
the European Resistance of WW2
the Vietnam War
thats all i can think of for now, but there are dozens more in American History alone