But it was no easy matter to reach this monument-like pile, though it could be done at much risk to the one attempting it. The configuration was so peculiar that one man at a time could creep along behind the other stones, until a point was almost reached which commanded the retreat, though the inmates, by pressing close against one side of the cavern, could escape the fire of an enemy.
On the other side there was no means of approach to such a position.
If a foe would climb up the rocks, and steal forward to a certain point, an active Indian could make a leap that would carry him to the cover of the pile, where he could aim and shoot into the cavern without risk to himself, provided he used ordinary caution.
Furthermore, it was unlikely that the Indians, skilled as they were in woodcraft, would fail to see this vulnerable point and their own coigne of vantage.
In truth they detected it almost on the same instant the fugitives hurried into the cavern.
CHAPTER XIX.
Fortunately both Gravity Gimp and Mr. Brainerd knew the peculiar construction of their refuge, and instant precautions were taken.
"Keep back as far as you can," said the elder, "and stay close to the wall on the right."
His order was obeyed, Habakkuk McEwen and the African both moving in that direction.