But they knew how to get rid of their gas masks, and as their steel helmets had fallen off during the attack, and as they had no weapons, they were not as heavily burdened as a soldier on the battle front would have been.

So they managed to get to the surface and strike out, though they did not know in which direction to swim, save toward the nearest shore. But to reach that was a task more easily thought of than carried out. The current was swift, and they could make little progress against it.

"Don't try to breast it!" cried Jimmy to Roger. "Let yourself float down, and work your way over to the nearest bank."

"All right! How are you?"

"Pretty rotten. I got a bad jolt on the head, but the water makes it feel better," said Jimmy.

"What happened to us, anyhow?" asked Roger, as he managed to get to his companion's side. "All I remember is being struck down. Did the Germans make a counter-attack?"

"It wasn't the Germans," declared Jimmy. "It was those two Bixton fellows from the signal corps. They attacked us!"

"What for?" cried Roger. "Are they German spies?"

"Well, they're as bad as that, if not worse," declared Jimmy. "They're traitors, I believe. They must have attacked us, as they threatened to do, because they found out that we, in a way, were responsible for Mike Bixton's being sent to jail. They threatened to do us up, and they did it."

"They surely did!" assented Roger. "Why, they might have killed us."