"Yes, sir."

"Very good, then," continued the young captain. "I am going to take your word for it this time. But if I ever find you slacking or shirking again, I am going to go to the colonel immediately and ask him to 'break' you back to the ranks."

"Yes, sir," assented Mock, saluting.

"Are you fully familiar with all your drill work?"

"Yes, sir."

"Then remember that our enemies, the German soldiers, are men who are drilled and drilled until they are perfect in their work, and that their discipline is amazing. Keep the fact in mind that we can hardly hope to whip our enemies unless we are at least as good soldiers as they. That is all. Go back to your men, Sergeant."

Standing stiffly erect, Sergeant Mock brought up his right hand in a crisp salute, then wheeled and walked briskly back to join his men. Greg turned as if to say that he did not feel the need of remaining to watch the rebuked sergeant.

"By Jove!" uttered Captain Cartwright. "I do wish, Holmes, you'd come over and dress down some of my non-coms. I've been trying for three days to put 'pep' into some of them, and the K.O. frowned at me this morning."

"Non-com" is the Army abbreviation for "non-commissioned officers"—-corporals and sergeants—-while "K.O." is Army slang for commanding officer.

Arrived at an unpainted wooden barracks, in size and appearance just like those of the enlisted men, the three captains entered and walked up a flight of stairs to the floor above. Here they passed through a narrow corridor with doors on both sides that bore the cards of the officers who slept behind the respective doors. Cartwright went to his own room, while Greg followed Dick into the latter's quarters.