Their journey was not exactly void of danger, for about halfway to the brigade headquarters, where they were to leave their messages, several Hun aeroplanes passed over the American lines. And at once some Allied machines came swooping along to give them combat. The German machines dropped several bombs, evidently searching out ammunition dumps, and one explosion took place in the road just before Roger and Jimmy passed over the spot on the motorcycle. "Whew!" cried Jimmy, as he crouched to avoid the shower of dirt and stones. "That was a close one!" "Too close for comfort!" agreed Roger. "Can you get around that hole?" "Just about," murmured Jimmy. "It's some hole!" But that was the only bomb that fell near them, and it was evident that it was not dropped for their discomfiture. For, though the Hun airmen might have observed the motorcycle shooting along beneath them, they would hardly have wasted a big bomb on it, when they might use the same weapon to set off a lot of American ammunition. "They're getting a bit too personal," observed Roger, as they speeded on. "And look, Jimmy! There are a lot of our planes going to smash up the Huns now." "Good enough!" returned Jimmy, not taking his eyes off the road ahead of him, for careful driving was required. "Maybe the Twinkle Twins are up there," added Roger, gazing aloft. "Maybe," assented Jimmy. And then, striking a fairly good stretch of road, he put on more speed, and they were soon at headquarters. Most of the officers, as well as many of the men, were out watching the combat of the air. It soon terminated in favor of the Americans, and when two of the hostile craft had been shot down the others turned tail and fled. "I hope our boys got the Hun who dropped the bomb so near us!" exclaimed Roger. They delivered their message, and were waiting for an answer to be prepared when they observed a squad of signal corps men passing on their way to duty. The officer in command had to stop at brigade headquarters for instructions, and, leaving his men standing at ease, he went inside the old farmhouse which served as an office for the commanders. "That's the same outfit the Bixtons are with," said Jimmy to Roger, recalling the incident of the dugout and his subsequent recognition of the two soldiers who had been talking to the civilians. "Are they there now?" asked Roger. "Don't see 'em. But maybe I can get some information. I'd like to know if Private Bixton, the chap we exposed at Camp Sterling, is any relation to the two men of the same name here." Jimmy strolled over toward the men of the signal corps who were waiting for the reappearance of their officers. Some of the lads who formed part of the "eyes and ears" of the army nodded in friendly fashion to the two Khaki Boys, and Jimmy, selecting a man who seemed to be a veteran in fighting and in signal work, remarked: "Haven't you a couple of fellows named Bixton in your outfit?"