They walked on in silence. Bob did not get off any of his queer, improvised rhymes, and as for Iggy he turned up the collar of his coat, hunched his shoulders; and seemed like some old man tramping along. "Hark!" suddenly called Jimmy, and the words came in a tense whisper. It was as if he had said "Halt!" for his chums came to a stop on the instant. "What is it?" asked Bob. "Don't you hear some one walking toward us?" went on Jimmy, his voice still low and tense. They all listened. The fog swirled around them in cold, white clouds. And then, through the darkness, they all heard, and distinctly, this time, the measured beat of marching feet. "Soldiers all right!" commented Roger in a whisper. "Yes, but what kind?" was Jimmy's question. "Are they our boys, some of the Allies or--Germans?" "What shall we do?" asked Franz, and, in the misty darkness he turned toward Jimmy, as seemed natural. "Keep still," was the advice given. "And crouch down. If they are Boches well let 'em pass--if they'll be so obliging as to go on. If they're some of our boys--" "Oh, boy! If they only are!" sighed Bob. The tramping feet came nearer. "They're headed right this way!" declared Franz, who was crouching down next to Jimmy. "Yes. But keep still! Don't even whisper. Sounds carry very far on a misty night--almost as they do over water." The thud of heavily shod feet sounded plainly now, and then, suddenly, so suddenly that it made the hearts of the Khaki Boys thump fiercely, there came a voice out of the darkness saying: "I don't believe we'd better go any farther, boys. We've come quite a way from our lines, and we haven't seen a sign of even a Hun sentry. We can go back and report the coast clear!" And the voice was that of an American! Hearing it Jimmy and his chums leaped to their feet. "Americans there"! sung out Bob. Instantly came the sharp challenge: "Who's there!" "Some of the 509th Infantry," answered Jimmy, giving the names of his companions and himself. "Advance, Sergeant Blaise! The others stay where they are. And remember our rifles have you covered, so don't try any funny work." It was a grim warning, but the five Brothers appreciated its need. Jimmy stepped forward, and the light from a pocket electric torch flashed in his face. "Don't know you, but you look all right," said a tall, young lieutenant who was in charge of the party, the tramping feet of which had so alarmed our heroes. "What are you doing here?" "It's a long story, but I'll cut it short," said Jimmy, and he did. The lieutenant listened with interest, and then, satisfied that the truth was being told, he remarked. "You'd better come back with us. We'll take care of you for to-night, and to-morrow you can send word to your command. I don't know this Captain Dickerson you speak of." "Are we near the American lines?" asked Bob. "Within half a mile," was the answer.