Their plan had been to steal upon their foes, taking them by surprise and forcing them to surrender. This plan was unexpectedly thrown awry however. One of the rifles leaned against the wall of the passage slipped; it fell to the ground carrying the others with it and a loud clatter was the result.

"Hein!" exclaimed one of the Germans wheeling quickly in the direction whence the noise came. Seeing three French soldiers stealing towards him he instantly whipped out his revolver and fired.

Leon, Jacques and Earl ducked quickly and instinctively.

"Let 'em have it!" shouted Leon and he let fly his hand grenade.

Straight down the passageway it sped and a tremendous explosion instantly occurred. The little room was filled with smoke and the three young soldiers could not see what was taking place in front of them. Earl too hurled his deadly handbomb into the chamber and a second explosion instantly took place.

"That's the way!" shouted Jacques. "That'll fix them I guess!"

All of the Germans had not been disposed of however. A moment later the sharp crack of a revolver sounded from behind the wall of smoke and a bullet winging its way through the half-light tore Jacque's hat from his head. Another and still another shot followed the first.

"That's enough of that," muttered the young Frenchman grimly and his hand-grenade took the same course that the two others had followed. A deafening concussion ensued and then all was still.

"Keep back against the wall," warned Leon. "Have your pistols ready."

Crouching low and keeping as far away from the center of the passage as possible the three boys awaited developments. Every boy grasped his revolver firmly in his right hand and peered eagerly in the direction of their enemies. Not a sound came from the room where the Germans had been assembled.