Along the ledge the men were stationed each with a pile of the grenades before him.

“See!” cried one of them from the ledge as he caught sight of one of our helmets appearing.

The others crouched and stared.  Del Mar himself hurried forward and gazed in the direction the man indicated.  There they could see Woodward, Arnold and the rest of us just beginning to climb up out of the water.

Del Mar aimed and fired.  One of the men had thrown up his arms with a cry and fallen back into the water.

Invaders seemed to swarm up now in every direction from the water.

On the semi-circular ledge about one side of the harbor, Del Mar’s men were now ranged in close order near a submarine, whose hatch was open to receive them, ready to repel the attack and if necessary retreat into the under-sea boat.

They fired sharply at the figures that rose from the water.  Many of the men fell back, hit, but, in turn, a large number managed to gain a foothold on the ledge.

Led by Woodward and Arnold, they formed quickly and stripped off the waterproof coverings of their weapons, returning the fire sharply.  Things were more equal now.  Several of Del Mar’s men had fallen.  The smoke of battle filled the narrow harbor.

In the office Elaine listened keenly to the shots.  What did it all mean?  Clearly it could be nothing less than assistance coming.

The man on guard heard also and his uncontrollable curiosity took him to the door.  As he gazed out Elaine saw her chance.  She made a rush at him and seized him, wresting the rifle from his hands before he knew it.  She sprang back just as he drew his revolver and fired at her.  The shot just narrowly missed her, but she did not lose her presence of mind.  She fired the rifle in turn and the man fell.

A little shudder ran over her.  She had killed a man!  But the firing outside grew fiercier.  She had no time to think.  She stepped over the body, her face averted, and ran out.  There she could see Del Mar and his men.  Many of them by this time had been killed or wounded.

“We can’t beat them; they are too many for us,” muttered Del Mar.  “We’ll have to get away if we can.  Into the submarine!” he ordered.

Hastily they began to pile into the open hatch.

Just as Del Mar started to follow them, he caught sight of Elaine running out of the office.  Almost in one leap he was at her side.  Before she could raise her rifle and fire he had seized it.  She managed, however, to push him off and get away from him.

She looked about for some weapon.  There on the ledge lay one of the hand grenades.  She picked it up and hurled it at him, but he dodged and it missed him.  On it flew, landing close to the submarine.  As it exploded, another of Del Mar’s men toppled over into the water.

Between volleys, Woodward, Arnold and the rest pulled off their helmets.