Now and then a cheer rose on the Essex as a shot went home.

Frank again returned to the bridge to report.

"Boom!"

It was a deeper voice that spoke this time.

The radio operator himself rushed to the bridge.

"Lion firing, sir," he said. "Says she has sighted us and for us to retire. No need of sacrificing ourselves Captain Jacobs says. The enemy can't get away."

At the same moment the lookout aft sang out again.

"Warship coming up astern, sir!"

"The second of our reinforcements," said Jack quietly. "I'll bet these fellows wish they had stayed home."

"I'm betting the same way," declared Frank.