She made rapid headway to the gulch and soon reached it.
"Where is the cave situated?" asked Jack.
"Opposite that big bowlder, on the left hand side," the sheriff replied. "You'd better put on your armor."
"I shall," Jack replied, as he stopped the Terror, "and you all had better arm yourselves, and prepare for trouble."
Their preparation, were hastily made.
As soon as everything was in readiness Jack alone went outside and assumed control of the wheel.
His friends ranged themselves at the windows.
All were well armed and ready for any danger.
In the course of a few minutes the Terror ran up to the big boulder and paused there.
Jack saw a mass of creeping vines that grew up the side of the wall, covering a dark aperture.