where you come in."

"I? What am I to do?"

"You and Guru are going to take a dozen men and round up as many of
Guru's people as you can find. Here is what you and Guru are going to
do."

In great detail Craig outlined the part the scientist and the dawn man
were to play in the attack on the Ogrum. They made an odd pair.
Michaelson, almost a physical weakling but possessed of one of the
keenest minds of the Twentieth Century; Guru, a splendidly muscled giant
but almost a child mentally.

"Do--do you think our part in the attack will really work?" the
scientist hesitantly asked.

"It's got to work," Craig said bluntly. "If it doesn't work, we are all
dead men."

CHAPTER VII

The Attack

At dusk a drum began to boom in the temple of the Ogrum. The sun was
just on the edge of the horizon. It hung in the sky as if it hesitated
to take the plunge below the rim of the world. Crouched hidden on the
mountainside as near the city as he dared take his men, Craig could see
the Ogrum, at the signal of the drum, start hurrying toward the temple
as if they were eagerly anticipating the hellish sacrifice soon to take
place.

To one side, beyond the notch in the mountains, was the swamp where the
dinosaurs fed. Already the sound of the great beasts fighting and
screaming could be heard.

All day long the Americans had remained in hiding near the city.
Fortunately none of the Ogrum had ventured to climb the mountain. Craig
had spent the day mercilessly rehearsing his men in the part they were
to play until they were perfect in their parts, or as perfect as they
could become in the short time available. The whole plan of attack
depended on split-second timing. If everything worked right, if
everybody did his job at the proper time, there was a chance that the
attack would be successful. If anything went wrong--Craig preferred not
to think about that. Around him, he could feel a tenseness creep over
his men as the zero hour approached.

The Ogrum, as if driven by the quickening beat of the drum, disappeared
within the temple.

The sun, making up its mind at last, plunged below the line of the sky.

Zero hour!

Craig could not see them but he knew that men had leaped from hiding and
were running toward the projecting wing of the temple that formed the
plane hangar. His fingers gripped the stock of the tommy-gun so tightly
the knuckles showed white. They had to get that hangar, first. The
planes had to be destr