The leading destroyer, in response to a signal from Admiral Beatty on his flagship, altered her course slightly and headed toward the coast of England.
The wireless instrument aboard the destroyer Essex clattered and a few moments later the radio operator rushed to the bridge with a message for Jack. The latter read it quickly, then said:
"Send an O.K. to the admiral?'
"What's up, Jack?" asked Frank.
"Lower half a dozen small boats, Mr. Hetherton," instructed Jack before replying to Frank's question, "and have them manned by a score of men each, fully armed."
"Aye, aye, sir."
Lieutenant Hetherton hurried away.
"What's up, Jack?" asked Frank again.
"I have been ordered to inspect each submarine as it comes abreast of us," Jack replied. "Apparently the admiral still fears treachery. I'll remain aboard here, and leave the work to you and the other officers."
This was done. As each submarine drew up with the Essex she was boarded by a score of the Essex's men. Some stood guard at the hatches with weapons held ready, while an officer and the others of the crew went below for a hurried trip of inspection, searching them diligently for "booby traps," and other signs of treachery.