By the time the excited crowd had piled outside powerful search-lights were reaching up into the starlit heavens, lifting out of the gloom with strange and fantastic effect the thin veil of clouds which here and there stretched across it.

Even amid the booming of the anti-aircraft batteries and the sharper staccato reports of the machine guns from various parts of the field, all blending into an unearthly din, the droning of the motors high in the air could be distinctly heard. Like a pyrotechnic display, luminous bullets, searching for the invaders, shot up into the sky, often piercing the low-hanging clouds; and mingling in with them were vicious little spurts of fire which told of the explosion of shrapnel shells.

The majority of the pilots, familiar with the dreadful danger which menaced them, made a wild dash for the underground shelters. But Don Hale and a few others, fascinated by the awe-inspiring scene and situation, remained.

“Isn’t this awful!” cried Bobby Dunlap, with a distinct tremolo in his voice. “Great Scott!”

At that instant a loud, though dull boom from the explosion of a bomb had added its quota of noise to the raging inferno of sound.

It hadn’t landed so far away, either, and, as Don Hale, in the grip of fear and excitement which he found impossible to control, strove to pierce the gloom, three reports, even louder, followed one another in quick succession.

“Great Cæsar!” cried Bobby Dunlap. “It seems as though they are going to wipe the aviation camp off the map. It’s time for us to run for our lives.”

And with these words, jerked out so fast that they were scarcely intelligible, he started off on a headlong sprint to join those who had sought a haven of safety.

But even then neither Don, George nor Albert could tear themselves away from the singular scene that was passing before their eyes. Every search-light—every gun was being used. Dazzling streams of whitish light crossed and criss-crossed or swept in wide circles over the sky—the darkness of night seemed to be rent asunder. Flaming bullets were rising by the thousand.

Notwithstanding the terrific defense of the French batteries the German bombs continued to fall. Their appalling detonations seemed fairly to shake the ground.