Joseph Alexander Altsheler,
The Guns of Europe — Chapter V:The Fight In The Blue
“ He thought of the currents of air, the mists, the vapors, and, above all, of those deadly pockets which could send them in an instant crashing to the earth far below. No engineer with his hand at the throttle of a locomotive was ever more watchful and cautious.John, too, was looking into the south, where he saw a loom of cloud and haze. It appeared that the heavens had drawn a barrier across their way, and he saw that Lannes was turning the Arrow again toward the west, as if he were seeking a way around that barrier. ”
