The new expedition, as proposed by Andrews, differed in three particulars from the first. He wanted a larger force,--twenty-four men instead of eight. He had seen that it was possible to carry a considerable number of men in disguise to the scene of action, and the number now requested was none too large for the capture of a full railway train or the overpowering of guards at important bridges. He also wanted some engineers to be detailed, in order that no mishap might leave them without the power of running their train. Five were secured, thus leaving an ample margin, as it was believed, for the possibility of capture on the way down, or of death by the enemy's bullets in the hour of conflict. It thus became an enterprise completely fitted out in Federal lines, without any reliance on help from the South. The third point of difference was of more importance than a casual glance revealed. The first expedition had an abundance of time. A week's delay, even after the soldiers were in the enemy's country, would have involved no risk, save that of discovery,--would, indeed, have been an advantage, as it would allow less time for the repair of damages done to the Southern railroads before Mitchel's arrival at Chattanooga. But now it was different. The whole division was ready to advance, its course being clearly indicated to the enemy, and moments became precious. By making the utmost speed it was still possible to have the bridges burned at the right time, but every hour's delay would render the work more difficult, and its success more uncertain. The bearing of this question of time will be made painfully apparent in our story. General Mitchel received the report of Mr. Andrews (which also embraced all the information the most skilful spy could have brought concerning the nature and disposition of the enemy's forces), approved his prudence in ordering the return of the soldiers, and sanctioned the second attempt. He, however, advised caution, saying that Andrews must not strike unless he saw a good prospect of success; but he made no objection to the increase of force, provided volunteers could be obtained. It was easy to secure the five engineers asked for without going beyond the limits of the three Ohio regiments composing General Sill's brigade. Of the detail as finally made out, nine men belonged to the Twenty-first, eight to the Thirty-third, and seven to the Second Ohio Regiments. CHAPTER II. MIDNIGHT CONSULTATION. On Monday, April 7, while I was inside my tent engaged in some of the little details of work which occupy a soldier's time in camp, a comrade pulled open the canvas door and called out,-- "Pittenger, Captain Sarratt is looking for you." I went out and met the captain, and together we walked up the street formed by the two rows of tents to the larger tent occupied by the company officers, which stood across the street at the upper end. He took me inside, and then said, with a sigh,--