“It’s too bad we can’t call him,” said Phil. But this was against the regulations, no loud cries of any kind being tolerated during the night. Had they given such a cry it would have been taken at once for an alarm, and this would have caused a commotion throughout the entire camp.

The three walked on past the spring and presently came close to the hill up which Dave had climbed. But here they saw no evidences of the missing lieutenant, and at last turned back to their quarters.

“I must say, Captain, I don’t like this at all,” said Roger.

“Neither do I, Sergeant. Unless Lieutenant Porter went off on some special mission, it looks to me as if something bad may have happened to him.”

“Do you think the Germans would dare to come so far behind our lines?”

“They might if they thought they saw a chance of capturing some of our men. It’s bad to have so many mine openings around.”

“Oh, I hope Dave hasn’t been captured!” cried Phil, in dismay.

With heavy hearts the three returned to their separate quarters. As soon as Captain Obray had left them, Roger and Phil acquainted their chums with what had occurred.

“Dave missing! You don’t mean it!” exclaimed Ben, and his face showed his concern.

“What in the world do you suppose could have happened to him?” asked Buster.