It was in vain that General Thomas tried to get a messenger through with secret despatches in cipher. General Bragg knew that he had the Union Army cornered and he had stationed a triple row of pickets who caught or shot every man that General Thomas sent.

Supplies and ammunition were both running low and General Thomas was considering massing a force of men on some point in the line in an attempt to break through far enough for a messenger to escape. This meant a great loss of life and probably would not be successful as the messenger would almost certainly be captured by an outer ring of scouts which Bragg would throw out as soon as he realized what was going on. There was only one other chance. The Confederates were so sure of their own strength, and that they would eventually capture the whole army, that they had not destroyed the railroad line which ran between the two Federal camps, hoping to use the same for shipping soldiers, prisoners and captured supplies later on. Both sides of the track, however, were lined with guards and covered by a number of Confederate batteries. General Thomas decided to make the attempt and called for volunteers who were willing to run this forty-mile gauntlet between the Confederate lines and batteries. Two old railroad men offered their services as engineer and fireman and they were accompanied by an adjutant who was to be the bearer of the despatches. There seemed to be only one chance in a thousand for this engine to get safely through and the men themselves, if they were not shot in their flight or wrecked with the engine, stood a good chance of being captured and hung as spies. In fact it seemed such a hopeless chance that at the last moment General Thomas was on the point of countermanding the order when one of the men themselves gave the best argument in favor of the plan.

"It's worth trying, General," said he, "for even if we fail, you only lose three men. The other way you would have to throw away at least a thousand before you could find out whether it was possible to cut through the lines or not."

It was decided to make the trial and a dark, moonless night when the sky was covered with heavy clouds was selected as the best time for starting. The men shook hands with their comrades and each left with his best friend a letter to be sent to his family if he were not heard from within a given time. There were but few engines in the Union ranks and none of them were very good as the Confederates had captured the most powerful. However, the ex-engineer and fireman picked out the one which seemed to be in best repair, put in an extra supply of oil to allow for the racking strain on the machinery and filled up the tender with all the fuel that it could carry. At half-past ten they started after firing up with the utmost care and in half a mile they were running at full speed when suddenly there was the sharp crack of a rifle and a minie bullet whined past the panting, jumping, rushing engine. Another one crashed through the window of the caboose, but fortunately struck no one. By this time the little engine was going at her utmost speed. At times all four of the wheels seemed to leave the track at once, she jumped so under the tremendous head of steam which the fireman, working as he had never done before, had raised. The engine swayed so from side to side as it ran that it was all that the adjutant could do to keep his feet. Finally they reached the first battery. Fortunately it had miscalculated the tremendous speed of the engine. A series of guns stationed close to the track hurled a shower of grape and solid shot at the escaping engine. It cut the framework of the caboose almost to pieces, but fortunately not a shot struck any vital part of the machinery or injured any of the three men. As they whirled on, the last gun of all sent a solid shot after them which struck the bell full and fair and with a last tremendous clang it was dashed into the bushes by the side of the road. All along the track there was a fusillade of musket-fire and bullets whizzed around them constantly, but none struck any of the crew. The next danger-point was at a junction with this road and another which ran off at right angles. This junction was protected by no less than two batteries and furthermore on the junction-track was an engine standing with smoke coming out of her smoke-stack showing that she was fired up ready for pursuit. It seemed absolutely impossible to escape these two batteries. Already they could see lanterns hurrying to and fro on both sides of the track where the guns were trained so close that they simply could not fail to dash the engine into a hissing, bloody, glowing scrap-heap of crumpled steel and iron. The men set their teeth and prepared for the crash which every one of them felt meant death. It never came. By some oversight, no alarm had been given and before the guns could be manned and sighted, the engine was whirling along right between both batteries, a cloud of sparks and a column of fire rushing two feet above her smokestack. The Confederates succeeded in only turning one gun and training it on the little engine fast disappearing in the darkness. The gunner, however, who fired that gun came nearer putting an end to the expedition than all the others. He dropped a shell in the air directly over them. It shattered the roof of the caboose, wounded the fireman and blew out both windows, but almost by a miracle left the machinery still uninjured. The adjutant laid the fireman on the jumping, bounding floor of the cab and under his faint instructions fired the engine in his place. As he was heaping coal into the open fire-box with all his might, there came a deep groan from the wounded fireman.

"Try and bear the pain, old man," shouted the engineer over the roar of the engine. "We'll be safe in a few minutes if nothing happens."

"Something's goin' to happen," gasped the fireman. "Listen!"

Far back over the track came a pounding and a pushing. The engineer shook his head.

"They're after us," he said to the adjutant, "and what's more they're bound to get us unless we can throw them off the track."

"Can't we win through with this start?" said the captain.

"No, sir," said the engineer, "they've got an engine that can do ten miles an hour better than this one and beside that, they've got a car to steady her. I don't dare give this old girl one ounce more of steam or she'd jump the tracks."