no one at that height could count on landing his explosive anywhere near the place he wanted it to go. Chances are that chap is only out on a spying trip. Aëroplane pilots are the scouts of the air these days, you understand. Nothing can be hidden from them."
"I understand," ventured Merritt, as they continued to watch the circling of the lofty observer and map-maker, "that there can be no surprises in this war, because the enemy always knows all about the massing of troops long before an attack can be delivered. An eagle or a hawk, hovering over shallow water, can see every bit of bottom when the surface is still, and so he's able to pounce down on the fish he's selected for dinner. These wonderful air-pilots will bring information of every contemplated move on the part of the enemy."
"Poor old Napoleon would be a back number in these days," Tubby sighed, "because you remember his strongest card was to divide the enemy, and then smash one army and then the other. They'd know all about his game in time to block it. The romance of war has gone glimmering, I'm afraid."
"Listen to all that shouting," said Merritt.
"Seems to be cheers, as well as these people can cheer, which is not like the good old United States way," Tubby commented.
"You can see what it means," remarked Rob. "There goes a Belgian biplane up, to get after the bold German!"
"My stars!" gasped Tubby. "Now we will see a circus! Think of two rival pilots maneuvering up there among the clouds, and trying to knock each other out! Whew! But watch him boring up in spirals, would you? Does the German see him, do you think, and is he beginning to skip out?"
"Nothing like that has happened yet, as far as I can see," admitted Rob. "There he starts around again, as if meaning to complete his map, no matter if a dozen Belgian or English airmen come up after him."
"It'll be a fight, then, see if it doesn't!" Tubby affirmed.
"There goes a second aëroplane, and this time a monoplane," Merritt told them, pointing as he spoke. "Unless I miss my guess, there's an English aviator in that machine. It doesn't carry the little Belgian flag the other does, you notice."
"Two against one," muttered the deeply interested Tubby. "Better be making up your mind to turn tail and run, Mr. Deutschland. The odds are against you, and, if you should get tumbled out of your seat a mile high, I'd hate to be under you when you strike the ground."
"They seem to be maneuvering for position," asserted Rob. "Yes, both are circling around now, and going still higher all the time. Before long the German will be hidden in that cloud bank, and that's what he's aiming to have happen."
"I thought I saw something like a little puff of smoke just then!" declared Merritt, who had exceptionally good eyes, strong almost as those of an eagle.
"Then they must be bombarding each other!" Tubby ventured to say, evidently greatly thrilled by the spectacle that could never have been dreamed of a few generations back.
"It's likely they are using their automatics, and trying to disable each other," admitted Rob, "though, between us, Merritt, I don't believe the tiny puff of smoke could be seen away down here, unless you had a strong glass. Of course, when moving as fast as they do, the chance of making a shot tell is next door to nix."
"Anyhow, they're chasing the German aëroplane off," Tubby declared. "That is the main object for the brave Belgians going up there."
The boys had made up their minds while on the way across that as Americans they must obey the President's appeal and be strictly neutral, if it were possible. They had many good friends who were of German descent, while others had English ancestors and near relatives.
The one country with which they sympathized deeply was Belgium. The stubborn and heroic way in which that seven millions of people had defied seventy millions, and the gallant manner in which their little army had tried to resist the invasion of their beloved country, had aroused the admiration of every one of the scouts.
As they stood there on that afternoon, and watched, they finally saw the German Taube vanish in the clouds, with the leading Belgian aëroplane following suit. Whether the pursuer ever overtook the foreign air-scout or not, the boys never learned.
"Well, that was a lively little tilt while it lasted," remarked Merritt as, the entertainment being over, the crowds again commenced sauntering back and forth, with everybody talking volubly about the spectacle in the heavens.
Soldiers gave them a curious look in passing. Every stranger in Antwerp was under more or less suspicion in those days, for it was becoming known that the German secret service had for years maintained the most wonderful system of spying in France, England and Belgium ever dreamed of. Antwerp had thousands of Teuton residents before the war, some of them leading merchants who owned splendid country places six or seven miles outside the city, where solid cement tennis courts afterward came in very handy as foundations for the immense German siege guns.
"We'll see plenty more things that will give us a thrill to beat that," Rob observed, pushing through the bustling, chattering crowds.
"Yes, and I'm afraid times may come when danger will hang over our heads," Merritt pursued, with a touch of regret in his voice. "Then you'll both be sorry you didn't let me go off on this wild goose chase, as it may turn out to be, by myself."
"What do you take us for, I want to know?" demanded Rob. "Haven't we been through all sorts of tough times together in the past; and why shouldn't we stand by our chum when he needs our help? What's a scout good for if he is ready to desert a comrade when the sky grows dark? That's just the time to show his true colors."
"You're taking the very words out of my mouth when you say that, Rob!" asserted Tubby valiantly. "No matter what happens, we're bound by the ties of old friendship. We'll sink or swim together, boys. And Merritt, please don't ever tell us again you're feeling sorry for letting us come along."
"If that man is to be found, we're going to corner him!" declared Rob, with his lips taking on the firm lines that marked them whenever he was making up his mind to hammer away persistently, like Grant did before Richmond; "and when we go back to the other side, we hope to be carrying that precious old paper your grandfather let get out of his possession in such a queer way."
"This seems like a pretty warm day to me, even for summer," observed Tubby irrelevantly.
"Now, we can give a pretty good guess, Rob," ventured Merritt smilingly, "that Tubby has a sly meaning back of that remark."
"Yes," added the patrol leader, "and the chances are three to one it has something to do with feeding."
"You are champion guessers, both of you," Tubby informed them, without seeming to be in the least ashamed of the confession. "I'm consumed by a violent thirst right now; and I bet you the milk in that shiny brass can that those two tired dogs have been dragging all over Antwerp this afternoon will have a lump of ice in it. Anyway, I'm going to test it; come along and let me stand treat."
Laughing at his earnestness, the others followed the fat scout across the street, where the old woman with her dog team was apparently resting, and observing the remarkably interesting sights around her.
Just then there were loud cheers that attracted the attention of the three boys.
"Something else coming along that's worth seeing," Merritt announced. "Better curb that fierce thirst of yours for a minute or two, Tubby, while we watch what's passing."
"Oh! well, I guess the milk won't sour while we're waiting," admitted the fat boy with a sigh of resignation, as he wheeled so as to face the street.
"What
