as he very well knew, this combat must be brought to a quick end or one
of the torpedoes was likely to find its mark.

From the deck of the second submarine, a hail of fire from a machine gun
was still being poured into the helpless lifeboats. What execution had
been done Jack had no means of telling at the moment, but he knew there
must have been some casualties.

"The brutes!" he muttered.

The duel between the submarine and the destroyer still raged. It appeared
that the commander of the submarine was a capable officer, for he had
succeeded in keeping his vessel from being struck by a shell from the
Brigadier.

In the aft turret of the Brigadier the British tars were sweating and
muttering imprecations at their inability to put a shell aboard the enemy.

"Here," said Frank, "let me get at that gun."

The crew stepped aside and the lad sighted the weapon himself. Then he
fired.

Again a cheer arose aboard the Brigadier. Frank's shot had been
successful. The shell struck the submersible squarely amidships, and
carried away the periscope.

"Fire!" cried Frank, and the other guns broke into action.

Again there was a wild cheer.