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The colonists walked rapidly and in silence.Top preceded them, sometimes running on the road, sometimes taking a ramble into the wood, but always quiet and not appearing to fear anything unusual.And they could be sure that the faithful dog would not allow them to be surprised, but would bark at the least appearance of danger.

Cyrus Harding and his companions followed beside the road the wire which connected the corral with Granite House.After walking for nearly two miles, they had not as yet discovered any explanation of the difficulty.

The posts were in good order, the wire regularly extended.However, at that moment the engineer observed that the wire appeared to be slack, and on arriving at post No.74, Herbert, who was in advance stopped, exclaiming,--"The wire is broken!"

His companions hurried forward and arrived at the spot where the lad was standing.The post was rooted up and lying across the path.The unexpected explanation of the difficulty was here, and it was evident that the despatches from Granite House had not been received at the corral, nor those from the corral at Granite House.

"It wasn't the wind that blew down this post," observed Pencroft.

"No," replied Gideon Spilett."The earth has been dug, up round its foot, and it has been torn up by the hand of man.""Besides, the wire is broken," added Herbert, showing that the wire had been snapped.

"Is the fracture recent?" asked Harding.

"Yes," answered Herbert, "it has certainly been done quite lately.""To the corral! to the corral!" exclaimed the sailor.

The colonists were now half way between Granite House and the corral, having still two miles and a half to go.They pressed forward with redoubled speed.

Indeed, it was to be feared that some serious accident had occurred in the corral.No doubt, Ayrton might have sent a telegram which had not arrived, but this was not the reason why his companions were so uneasy, for, a more unaccountable circumstance, Ayrton, who had promised to return the evening before, had not reappeared.In short, it was not without a motive that all communication had been stopped between the corral and Granite House, and who but the convicts could have any interest in interrupting this communication?

The settlers hastened on, their hearts oppressed with anxiety.They were sincerely attached to their new companion.Were they to find him struck down by the hands of those of whom he was formerly the leader?

Soon they arrived at the place where the road led along the side of the little stream which flowed from the Red Creek and watered the meadows of the corral.They then moderated their pace so that they should not be out of breath at the moment when a struggle might be necessary.Their guns were in their hands ready cocked.The forest was watched on every side.Top uttered sullen groans which were rather ominous.

At last the palisade appeared through the trees.No trace of any damage could be seen.The gate was shut as usual.Deep silence reigned in the corral.Neither the accustomed bleating of the sheep nor Ayrton's voice could be heard.

"Let us enter," said Cyrus Harding.

And the engineer advanced, while his companions, keeping watch about twenty paces behind him, were ready to fire at a moment's notice.

Harding raised the inner latch of the gate and was about to push it back, when Top barked loudly.A report sounded and was responded to by a cry of pain.

Herbert, struck by a bullet, lay stretched on the ground.