re being driven!
Rally, here! Rally!"

Beyond, a louder crackling sounded. Here, there, men plunged down. The
retreat was becoming a rout!

Yelling, Gabriel flung himself upon the men.

"Back there!" he vociferated. "Back, and at the walls! Come on, boys,
now! Come on!"

His voice, well known to nearly all, thrilled them again with new
determination. A shout rose up; it swelled, deepened, roared to majestic
volume.

Then the tide turned.

Back went the fighting men of the great Revolution. back at the
machine-guns, mounted in the breached walls.

Gabriel was caught and whirled along in that living tide. He found
himself at its crest, its foremost wave. Behind him, a roaring, rushing
river of men. Before the Inner Citadel.

Gathering speed and weight as it rolled up, the wave broke like an ocean
surge over a crumbling dyke.

Down went the Air Trust gunners and the guns, down, down to
annihilation!

Through the breach, foaming and swelling with irresistible power burst
the tides of victory.

Silenced now were the Trust guns. The steam-jets had none to man them.
Far aloft, a last explosion told the death story of the final
_epervier_.

Here and there, from windows and corners of the wrecked and blazing
plant, a little intermittent firing still continued; but now the hearts
of these Air Trust defenders--scabs, thugs and scourings of the
slum--had turned to water, in face of the triumphant army of the working
class.

They fled, those mercenaries, and all the ways and inner
strongholds--such as still were left--now lay open to Gabriel and his
comrades.

Lighted by the blazing buildings and the vast fire torch of an
oxygen-tank off to eastward, they stormed the final citadel, the steel
and concrete laboratories, heart and soul and center of the hellish
world-conspiracy.

Stormed it, as it began to blaze and crumble; stormed it, in search of
Flint and Waldron, would-be murderers of the world.

Stormed it, only to see Herzog gnash his teeth upon the flask, and
fall, and die; only to know that there, within the rock-hewn,
steel-lined tanks, below, their enemies had still outwitted them!

The swift onrush of the fire drove the victors back.

"_Out, comrades! Out of here_!" shouted Gabriel, facing the attackers.

None too soon. Hardly had they beaten a retreat, back into the vast
courtyard again, strewn with the dead, when a second oxygen tank
exploded, overwhelming the laboratory building with tons of f