egan to
die out behind it grew louder in front, and another troop of the enemy
came into sight, tearing along after their leaders, to dash through the
gap in ones and twos, trailing along till the last had disappeared.

"That must be all," panted Chris to himself; but he was wrong; the
echoes of the rocky walls had not ceased, though greatly softened down,
for two dozen more of the savages came tearing along like a rearguard to
pass through, and even then more were to come, for a couple raced up,
shouting at and beating the flanks of their ponies angrily, as if in
fear of being left quite behind.

"The last!" thought Chris, now wild with excitement, for the
reverberations had ceased in front, were dying out behind, and then all
was still for a few moments, before out of the utter silence came the
soft piping sound of a whistle.

"Hurrah!" cried Chris, for he felt that he must get rid of the breath
that literally burned in his chest as he sprang up.

Then crash, splinter, and shiver came from below as the doctor forced
the first block to the edge of the shelf where the opening was most
narrow.

This was almost accompanied by another shivering crash, repeated both
from the walls of the gulch like so much smothered thunder.

"Now for it!" panted Chris, as he caught sight of Ned bending down to
roll a great block far too big for him over and over. But the one he
was himself handling was as big, and Ned, who was not ten yards away
from him, laughed mockingly as he got his block to the edge first and
sent it down with a crash.

But the noise made by the one sent after it by Chris formed as it were
an echo, and he stood for a few moments gazing down in wonder, for huge
pieces had been forced off the shelf by Wilton and Bourne, to lie
gathered so closely together that already the way was blocked
sufficiently to make it impossible for any horse to pass unless at a
flying leap, for which there was neither take-off nor landing at the
end.

"Don't shout. Don't cheer," panted the doctor. "Work steadily and
well, and we shall soon have them fast."

"I hope there are no more to come and have us," panted Wilton as he
slaved away, making Chris and Ned both glance excitedly away through the
gulch towards where the gully struck off.

But the enemy seemed to be all within the trap, and the stones were
forced down till nearly all available on the shelves had been sent
thundering down, and both parties climbed some fifty feet