"All right; you can do nothing more so far as he is concerned," decided the officer. "We'll make a thorough search of these sleeping-quarters, and see if we can find any candles. Knowing the systematic thoroughness of Fritz, I guess he's taken precautions in the event of the electric light going out. By Jove," he added, as the dug-out trembled violently, "there's some strafing going on outside!"