All we now have to fear will be other German aircraft, but there'll be fleets of them sent out to look for us!" Prescott nodded, though he could not hear in the roar of the motors and the rush of the air past him.
A mile below them the blackness of the night was punctured by a lively little volcano of red and yellow jets.

A dozen anti-aircraft guns opened fire on the fugitive airplane, whose course must have been telephoned along the line.

Some of the shells burst so close that fragments of metal whizzed about the ears of both Americans; some of the shells went far wide of the mark, but at least two of the gunners followed the moving craft for the distance of a mile with an accuracy that caused the two fugitives in the sky the liveliest uneasiness.

The gunners were aiming by the sound of the engines.
"Give us fifteen minutes more at this speed," Tom roared, "and we'll be back over our own French lines!" They were soon going at terrific speed, fifteen thousand feet up in the air, when a terrifying peril beset them.
Out of the blackness ahead, bearing straight at them, came a dozen German airplanes in splendid formation!.