The battle was tactically inconclusive, although Lee failed to achieve his objective of preventing the Federal escape and crippling McClellan's army, if not destroying it. Longstreet's performance had been poor, sending in brigade after brigade in a piecemeal fashion, rather than striking with concentrated force in the manner for which he would be known later in the war. He also was not supported by Huger and Jackson, as Lee had planned. Instead of attacking, both generals merely kept their divisions on the north side of White Oak Swamp and launching no action other than an occasional artillery exchange. Union casualties were 3,797 (297 killed, 1,696 wounded, and 1,804 missing or captured). Confederate casualties were comparable in total—3,673 (638 killed, 2,814 wounded, and 221 missing)—but more than 40% higher in killed and wounded. Longstreet lost more than a quarter of his division. Union generals Meade, Heintzelman, Edwin V. Sumner and Confederate generals Joseph R. Anderson, Dorsey Pender, and Winfield S. Featherston were wounded.