“But they know we came here by an underground passage from the house,” said Brenda; “will they not suspect we have entered another passage if we all disappear?”

“P’r’aps they may,” answered Mr. Arnold; “I had not thought of that.  We’ll have to take our chances.”

“If one of us was to appear to escape from here, and join them,” continued the girl, “I think they would suppose the others had perished, and make no search.”

“That may be true, but I’ll take my chances here,” said Mr. Gilbert.

“So will I,” said his companion.  “A fellow wouldn’t last a minute outside this fort.  I prefer smothering to the death those devils will give me.”

It soon became evident to the besieged that the outer wall was on fire.

The sun had gone down and darkness was deepening in the valley when the first tongue of flame licked through a crevice in the roof and showed that the fire had gained a foothold.  Soon a hole appeared, close to the eaves, which gradually enlarged towards the centre of the roof and along the surface of the earth.  With blankets the fire was beaten out on the sides, but it crept insidiously along between the timber and earth covering.

In making the roof, branches of pine had been spread over the timber, and the branches in turn covered with a thick layer of straw to prevent the earth from filtering between the logs.  This material was as dry as tinder, and held the fire.

The men stood at the loop-holes and compelled the savages to remain under cover of the out-building, while the four girls exerted themselves to keep the fire from showing inside.  Delay until help could arrive from Whipple was what all were struggling to gain; but the increasing heat and smoke showed the defenders at last that they could no longer put off retiring to the covered way.

The word was given and all entered it, and the men with shovels began to close the entrance.  When it was a little more than half closed the hole in the roof had become triangular, resembling the space between two spokes and a felloe of a wheel.  On the earth, or felloe side of the triangle, there was no fire; but the other sides were burning fiercely.

Making a sudden dash, and before any one could realize her intention, Brenda leaped past the shovellers, sprang over the embankment they were throwing up, and by the aid of a bench sprang up the four-foot wall, through the flame-bordered aperture, and disappeared, her clothing apparently in a blaze.  The war-whoops immediately ceased.

No attempt at pursuit or rescue was made.  The Arnolds and the strangers felt that it would be useless, and only result in the death of the pursuers.  The work of closing the passage was resumed and completed, and all sat down to await the slow flight of time and the possible arrival of the soldiers.

After listening to the story of the Arnolds I concluded that Brenda had fallen a victim to the cruelty of the Apaches, and that we should find her mutilated and disfigured body.  A rapid and excited search was at once began.  Far and wide, over plain, through ravines, and into the foot-hills rode the soldiers, leaving no part of the country for several miles around unsearched; but not a trace of the missing girl was discovered.