midnight
They walked away together and Harry rejoined those of his own age near the banks of Bull Run . But Langdon and St. Clair were sound asleep on their blankets , and so were all the rest of the Invincibles , save those who had been posted as sentinels . But Harry did not sleep that night . It was past midnight now , but he was never more awake in his life , and he felt that he must watch until day . He had no duties to do , and he sat down with his back to a tree and waited . Far in his front , three or four miles , perhaps , he thought he saw lights signaling to each other , but he had no idea what they meant , and he watched them merely with an idle curiosity . Once he thought he heard the distant call of a trumpet , but he was not sure .