Then, even as Lord Hastings received from the Lion the command to advance, he read the last signal of the Glasgow.

“Submarine has halted us,” it read.  “Dead ahead.”

The motorboat fleet came to life upon the instant.  Again it divided into two parts, one passing on each side of the Glasgow, and darted forward toward the enemy.

Aboard each the forward guns were manned, the gunners ready to fire at the word.

On the Glasgow all was confusion.  Passengers, attracted by the sound of the shot from the submarine, sprang from their tables and dashed on deck.  There, as they made out the submarine, they turned pale.  Only the reassuring voices of the officers averted a panic.

Then the passengers turned their attention to the fleet that was now passing around the big liner to the attack.

Rapidly the little craft sped forward and before the submarine commander had divined their presence, they were swooping down upon him, seemingly from all directions.  Stunned at this unexpected arrival and before he could give a word of command, The Hawk unloosened her forward gun.

The shell went wide, but it brought immediate action from the submarine commander.  Evidently he had no mind to try and torpedo the little craft, realizing, perhaps, that did he sink one the other would destroy him.

Motioning the other three men on deck before him, he sprang toward the little conning tower, bent on flight.

At this juncture the Lion came within range and her forward gun spoke loudly.  The shell kicked up the water a few yards from the submarine.

“Hoorah!” came the British cry.

“A little soon to cheer,” muttered Frank to himself, as he stepped forward to take his second shot at the submarine.

“Boom!”

The gun spoke sharply.

Ahead there was a terrible crash.  The German submarine seemed to soar in the air like a skyrocket, and came down in a thousand pieces.

Frank’s one well-directed shot had ended the battle.

Then a mighty cheer went up from the men of the mosquito fleet, in which the passengers aboard the Glasgow joined with a will.

Jack sprang forward and gave his chum a resounding slap on the back.

“That’s what I call shooting,” he declared fervently.

“Good work, Frank,” said Lord Hastings quietly, stepping forward.  “An excellent shot.”

Masses of wreckage floating upon the surface of the sea were all that was left of the German submarine, with here and there a few floating bodies.  Soon these disappeared and there was nothing to indicate that an under-sea craft had so recently been near.

From aboard the Lion, Commander Thompson signalled his compliments to The Hawk.

“And now I suppose we will go back again,” said Frank to Lord Hastings.

“Well, no,” was the reply.  “The Glasgow is not safe yet.  There may be other submarines in these waters.  I should say that we shall escort her all of a hundred miles.”