ly the distant earth below could be seen; and
then Chester cried:

"Look! We are almost beyond the camp. We shall clear it when we hit
the ground."

Hal glanced down.

"So we shall," he agreed, and there was hope in his voice.... "Maybe I
will be able to fix the engine before we are discovered."

Nearer and nearer to the ground glided the huge machine. They were now
well beyond the farthest outposts of the camp, and consequently had
recovered their good spirits.

The airship came gently to earth, and the boys jumped out. As they did
so, there came the faint sound of a command and a rifle cracked.

"We are discovered!" shouted Hal. "Quick! To the woods!" And the boys
made a dash toward a clump of trees that could be seen in the distance.

Desperately the two lads ran toward the woods, and, as they ran, the
first single rifle shot was followed by a volley; but, thanks to the
semi-darkness, the boys gained the shelter of the woods unscathed.

Once under the friendly shelter of the trees the boys did not diminish
their speed. Rather, if possible, they ran faster. Then, suddenly they
stopped; and the cause of their abrupt halt was this:

A heavy crashing in front of them gave evidence of the approach of a
large body of men. For a moment the lads stood as if frozen to the spot;
then Hal cried:

"Up in this tree, quick! It's our only chance!"

Acting upon the instant, the two lads swung themselves into the crotch of
the great tree under which they stood; then climbed noiselessly higher up
among the branches. Just as they had succeeded in screening themselves
from possible discovery, a body of horsemen burst in among the trees.

"Caught right in between them," whispered Hal.

"Yes; and, if we get out of this fix alive, we are in luck," Chester
whispered back.

The horsemen below them did not pause in their march, but continued on
through the woods.

"Evidently a scouting party returning," whispered Hal.

And still the long line of horsemen pressed on beneath them.

Suddenly there came the sharp crack, crack, of many rifles; and from
beneath the two lads came the hoarse command of an officer:

"Forward!"

The line of horsemen quickened their pace; and then the firing ahead
broke into a loud and steady roar.

For many minutes, it seemed to the two lads, the stream of horsemen
poured on beneath them. Then the sound of firing became less distinct,
and Hal and Chester dropped to the ground.

"At last! At l