 On May 5, after Grant's army crossed the Rapidan and entered the Wilderness of Spotsylvania, it was attacked by Confederate Gen. Robert E. Lee's Army of Northern Virginia.Although Lee was outnumbered, about 60,000 to 100,000, his men fought fiercely and the dense foliage provided a terrain advantage.After two days of fighting and almost 29,000 casualties, the results were inconclusive and neither army was able to obtain an advantage.