ing in anticipation of another hard day's work ahead. Off to the right a fire was burning, perhaps some building in the process of destruction to prevent its falling into the hands of the Americans, who were in line to overwhelm it on their next day's drive.
These things, however, received very little attention from the raiders. They were more interested in the possibility of their progress being halted by some block of Hun machines, bent on breaking up the raid before it was well started.
No doubt, information had leaked concerning the assembling of all these latest model planes. There were always ways whereby clever and daring spies could communicate with their mates on the other side of the fighting line, which was the main reason for so much secrecy in planning this particular expedition.
So most of the time both Tom and Jack kept their eyes fixed on the line ahead, waiting eagerly for the signal to close in.
"There she goes!" called out Jack suddenly; but of course his companion had already seen the signal light from the leading plane, and was commencing to carry out his part of the programme.
Enemy planes had been discovered barring their further progress, quite a squadron of them being in the air, with others rising as they caught
