"By George! I thought I saw some myself," was Frank's answer.

Suddenly there was a crash as the forward turret guns aboard the Brigadier
burst into action. Looking ahead, Jack gave a startled cry, and no wonder.

For, from beneath the water, appeared a periscope and then the long low
outline of a German submarine came into view.

Again the Brigadier's guns crashed, but the shells did not strike home.

Before the destroyer could fire again, a gun appeared as if by magic on
the submarine's deck, and a hail of bullets was poured into the first of
the nearby lifeboats. At the same time the U-Boat launched a torpedo at
the Brigadier.

Jack gave a cry of horror at the predicament of those in the small boats.
But he did not lose his head, and at the same time maneuvered his ship out
of the path of the torpedo.

Came a hail from the lookout aft.

"Submarine off the stern, sir!"

At the same moment the battery in the Brigadier's turret aft burst into
action.

"Forward with you, Mr. Chadwick," cried Jack, "and see if you can't get
better results there. The men seem to have lost their nerve."