"Check," Dave said. "And that track is supposed to lead to Dunkirk. Gosh, I hope the British are still there."

"They must be there," Freddy said firmly. "You can still hear the guns up ahead, so there must be somebody besides Germans around. I say, look at that fog, or is it fog? Yes, it is. And it's beginning to rain, too. Well, thank goodness for that. We won't be seen or heard so easily. Right-o, Dave. Let's get on with it. Like the chaps in the R.A.F. say, Tally-ho!"

"Tally-ho!" Dave echoed happily and started scrambling up out of the cave.

Walking side by side, and gripping hands to hold up the other fellow in case he slipped and started tumbling into a bomb crater, the two boys struck out boldly along the single line of track. Before they had traveled a hundred yards the railroad tracks stopped being what they were supposed to be. They became a long stretch of twisted steel and pulverized ties. But though the road bed was constantly pock marked with bomb craters it served as a guide eastward for their crunching footsteps.

Layers of fog came rolling in from the east, and with every step a fine chilling rain sprayed down upon them. But rather than being annoyed and uncomfortable, they were buoyed up by the miserable weather. It gave them added protection from any German patrols in the neighborhood. It hid them from the rest of the world of dull constant sound, and the shimmering glow of red to the east and to the south. There was more sound, and a more brilliant glow of red to the south, and as they heard it and saw it their hearts became even lighter. If there was all that sound to the south it must mean that the Germans had not been able to cut off the retreating armies at Dunkirk. And of course that was true, for as they trudged and stumbled along the bomb blasted strip of spur railroad track some fifty thousand do or die British soldiers were holding back the savagely attacking German hordes at Douai, and at the Canal de Bergues, so that some three hundred and thirty thousand of their comrades might escape the trap from Dunkirk and reach England in safety.

Of course Dave and Freddy didn't know that at the time. Yet, perhaps they sensed it unconsciously, for their step did become faster, their hearts lighter, and the hope they would get through somehow mounted higher and higher in their thoughts. And so on and on they went. A thousand times they stumbled over things in the darkness; went pitching together down into bomb craters, or barked their shins and raised lumps on their tough bodies. Always forward, though. They stopped talking to conserve their energy, for they had no idea how many miles of bomb blasted roadbed lay ahead of them. The fog and the rain dulled the sound of the guns so that they couldn't tell if they were drawing nearer or actually heading away from them. And although they looked at it a million times apiece the dull red glow ahead of them seemed always to remain the same. It never once brightened up or faded down. It got so that it seemed as though they were walking on a treadmill. Walking, walking, yet never seeming to get any place. Never seeing anything different to give them proof they had covered ground. Every piece of twisted track they stumbled over was the same as the last. A bomb crater into which they fell sprawling was no different from all the others. And the darkness, the fog, the rain, the boom of the guns, and the shimmering red glow were always the same in the next second, in the next minute, and in the next hour.

Grit, courage, and a fighting spirit resolved never to give up, forced them forward foot after foot, yard after yard, and mile after mile. Even thoughts ceased to stir in their brains, and there was nothing there but the fierce burning flame that drove their tired legs and bodies forward.

Then, suddenly, their separate worlds seemed to shatter before their eyes in an explosion of sound. To Dave it seemed close to an eternity before the sound made sense in his dulled brain. Then in a flash he realized that nothing had exploded. A loud voice not three feet in front of them had bellowed out the challenge.

"Halt!"

Even then neither of the boys could grasp its true meaning. The voice shattered their hopes, gripped their hearts with fingers of ice, and seemed to drain every drop of blood from their bodies. Fate was having the big laugh on them at last. The worst, the one thing they had dreaded had come to pass. They had stumbled headlong into a nest of Germans!