O’Reilly drew a deep breath of relief.  He had never become wholly accustomed to the giant light-beetles of the tropics, although he had carried one often on sentry duty to see the face of his watch, and not infrequently had seen Cuban women wearing them in their hair as ornaments.

“Jove!” he muttered.  “It gave me a fright.”

Hilario resumed his instructions:  “If anything goes wrong, wait here.  Don’t ride away until we have time—­”

“Never fear.  I won’t desert you,” the American reassured him.

The two white-clad figures slipped away, became indistinct, and then disappeared.  The night was hot, the mosquitoes hummed dismally and settled in clouds upon the waiting pair, maddening them with their poison.  After a time a horse snorted and Jacket cursed nervously.

“I’d like to see where we are,” the boy muttered.

“Do you know these men?” O’Reilly asked him.

“No.  God deliver me from such unpleasant fellows.”

“I hope they’re honest.”

“Humph!  I trust nobody.”  There was a pause.  “Never mind,” Jacket assured his companion.  “I will make short work of them if they prove to be traitors.”

A half-hour passed, then the two ghostly figures materialized once more.

“Dios!” grumbled Hilario.  “There are many strings to this Spanish guitar.  What a row when they discover that I have played a Cuban danzon upon it.”  The old man seemed less surly than before, and O’Reilly felt ashamed of his recent suspicions.

“Is the way clear?” he inquired.

“As far as the railroad, yes.  We heard voices there, and came back.  We will have to cut our way forward after we cross the track.  Now then, follow me without a sound.”

Leading his horse by the bit ring, Hilario moved out into the clearing, followed once more by his three companions.  Concealment was out of the question now, for their only covering was the darkness.  O’Reilly had the uncomfortable feeling that the cavalcade bulked monstrous big and must be visible at a great distance; he experienced much the sensations of a man crossing a sheet of thin ice with nerves painfully strained, awaiting the first menacing crack.  In spite of all precautions the animals made a tremendous racket, or so it seemed, and, despite Hilario’s twistings and turnings, it was impossible to avoid an occasional loop of barbed wire, therefore flesh and clothing suffered grievously.  But at length the party brought up under the railroad embankment and paused.  Out of the voids to their right came a faint murmur of voices.  As carefully as might be the four men ascended the slope, crossed the rails, and descended into the ditch on the other side.  Another moment and they encountered a taut strand of barbed wire.  The metallic snip of Hilario’s shears sounded like a pistol-shot to O’Reilly.  Into the maze of strands they penetrated, yard by yard, clipping and carefully laying back the wire as they went.  Progress was slow; they had to feel their way; the sharp barbs brought blood and muttered profanity at every step.