The same day McClellan, whose whole army was at Frederick, received a copy of Lee's orders. They had been wrapped round three cigars and lost by a careless Confederate staff officer. Had McClellan forced the gaps immediately, maneuvered with reasonable skill, and struck home with every available man, he might have annihilated Lee. But he let the thirteenth pass quietly; and when he did take the passes on the fourteenth it cost him a good deal, as the Confederate infantry had reinforced Stuart. On the fifteenth Jackson took Harper's Ferry. On the sixteenth he joined Lee at Antietam. And on the seventeenth, when the remaining availables had also joined Lee, McClellan made up his mind to attack. "Ask me for anything but time," said the real Napoleon. The "Young Napoleon" did not even need the asking. Antietam (so called from the Antietam Creek) or Sharpsburg (so called from the Confederate headquarters there) was one of the biggest battles of the Civil War; and it might possibly have been the most momentous. But, as things turned out, it was in itself an indecisive action, spoilt for the Federals, first, by McClellan's hesitating strategy, and then by his failure to press the attack home at all costs, with every available man, in an unbroken succession of assaults. He had over 80,000 men with 275 guns against barely 40,000 with 194 guns of inferior strength. But though the Federals fought with magnificent devotion, and though the losses were very serious on both sides, the tactical result was a mutual checkmate. The strategic result, however, was a Confederate defeat; for, with his few worn veterans, Lee had no chance whatever of keeping his precarious hold on a neutral Maryland.