"No; Germans," was the response. "We built that wall the better to defend ourselves if we are attacked."
"You're far-seeing, at all events," declared Jack.
Half a dozen men advanced from the enclosure to meet Captain Jack and his party. The pirate chief saluted them and they greeted him cordially.
From the top of a wooded building inside the enclosure Frank made out a large wireless aerial.
"Captain Jack is a modern pirate, all right," the lad told himself.
"Send Jackson to me," ordered Captain Jack, as he followed his prisoners into the large wooden building.
A man left the room, but reappeared a few moments later, followed by a man of extremely large stature.
"Jackson," said Captain Jack, and indicated the four captives with a sweeping gesture, "these men are prisoners and I want them well guarded. You'll lock them up in the strong room and post guards outside. You will keep the keys to the door yourself. No one must enter without my permission. Do you understand?"
"Yes, sir," replied Jackson.
"Good. Take them away, then."