"We think so," assented the aviator. "We know more of their lines than they can possibly know of ours. For the rest of this war I guess we will have to do so. We are going forward from now on, and the Teutons are going back, and don't you forget it. We have to know their lines well, and lots of other things, such as their routes of supply and reinforcement, and their gun positions and munition dumps. Our guns look to us, too, in a way they did not look to us a year ago, even. It's a big game."

The Brighton boys walked on slowly, without comment. Yes, it was a big game, in very truth. The closer they came to it the bigger it became.

"Hello! There is a monoplane. I thought there were no monoplanes in use now," said Bob Haines as they passed a round-bodied fleet-looking machine with a single pair of wings. It was a single-seater. They walked up to it and round it, gazing admiringly at its neat lines. "What sort of a plane is this?" asked Bob of a mechanic who was standing beside the machine.

"An absolute hummer," was the reply. "Want to try her? You have to be an Ace to get into her driving seat, son."

Bob flushed, and was inclined to answer sharply, but Joe Little stepped forward and said quietly: "We have just got here from the States. Came last night. This is our first look-around, and we want to learn all we can. We did not know monoplanes were being used now. The only aeroplanes we have flown have been biplanes. Won't you tell us something about this type?"

"Certainly," said the mechanic. "I was only joking. No one can fly this sort of machine except the most experienced and best pilots. It is the fastest machine in the world. It is a Morane, and they call it a 'Monocoque.' Someone told me that the latest type German Fokker was modeled on this machine. It is a corker, but the trickiest thing to fly that was ever made. We have only got one here. I heard a French flyer say the other day that the Spad biplane was faster than this machine, but I don't believe it."

"What is an Ace?" queried Jimmy Hill.

"That term started with the French," answered the mechanic. "We use it here now, sometimes. It means a superior aviator, who has brought down five adversaries, in fair air-fight. The bringing-down business, at least so far as the exact number is concerned, is not always applied, I guess. They just call a man an Ace when he is a real graduate flyer, and gets the habit of bringing down his Boche when he goes after him."

Every conversation around that part of the world seemed to have a grim flavor. The Brighton boys were getting nearer to actual war every minute, they felt.

The boys found a row of S.P.A.D. machines not far distant. The "Spads," as the aviators called them, were fleet biplanes. They found a genial airman to tell them something of the planes, which he described as the latest type of French fighting aeroplane. "This sort has less wing surface than any machine we have had here," said the airman. "It is mighty fast. These four have just come back from a good pull of work. I think this lot were all that is left of two dozen that were attached to the B squadron just before the last big push."