"It's supper and sleep for me," said Harry. "It doesn't do to let your imagination run away with you. You know that Lee and Old Jack and Jim Longstreet have arranged for everything."

They ate their suppers, and, the general giving them leave, they lay down in the tent next to his, wrapped in their blankets. Harry slept soundly, but while the pitchy darkness of a winter night still enclosed the land he was awakened by a heavy rumbling noise. His nerves had been attuned so highly by exciting days that he was awake in an instant and sprang to his feet, Dalton also springing up with equal promptness.

They saw General Jackson standing in front of his tent and peering down in the darkness toward the river. Other officers were already gathering near him. Harry and Dalton stood at attention, where he could see them, if he wished to send them on any errand. But Jackson was silent and listening.

The heavy rumbling reports—cannon shots—came again, but they were fired on their side of the river.

"Gentlemen," said General Jackson, "the enemy has begun the passage. Those are our guns giving the signal to the army."

Harry's pulses began to throb. But, although fires flared up here and there, little was to be seen in the darkness. Fortune seemed to have shifted suddenly to the side of the Union. Not night alone protected the bridge builders, but a thick, impenetrable fog, rising from the river and the muddy earth, covered the stream and its shores. The Southerners could not see just where the bridge head was and their cannon must fire at random through the heavy darkness. Sixteen hundred Mississippians were stationed in Fredericksburg below, well concealed in cellars and rifle pits, but they could not see either, and for the present their rifles were silent.

But Harry's imagination immediately became intensely vivid again. He fancied that he could hear through all the shifting gloom the sound of axes and hammers and saws at work upon that bridge. These army engineers could throw a bridge across a river in half a day. He recognized at all times the great resources and the mechanical genius of the North. The South had good bridge builders herself, but she had bent all her powers to the development of public men and soldiers. Harry felt more intensely all the time the one-sided character of her growth and its defects.

Dalton stood by Harry's side, and the darkness was so intense that he seemed but a shadow. A little further away was Jackson. No fires had been lighted in his camp, but nevertheless he was not a shadow. That personality, quiet and modest, was so intense, so powerful that it seemed to Harry to become luminous, to radiate light in the blackness of the night. It was imagination, he knew, at work again, but it was Jackson who had loosed its springs.

"Can you see your watch, George?" he whispered to Dalton.

"Yes, and its says only twenty minutes past three in the morning."