After an accurate calculation of direction and velocity of wind, a course of thirty-nine degrees was steered from "D" lighthouse; the river Saar was crossed north of Saarburg; Bitsch and Pirmasens were passed to the north and Kaiserlautern to the south and then, the Vosges Mountains having been crossed, Jock and his companion looked down on the Rhine valley. The Rhine River was crossed north of Oppenheim, and from an elevation of six thousand feet, Mainz, at the juncture of the rivers Main and Rhine, showed clearly in the moonlight. Still holding their course, the aviators looked out to the left, followed up the river Main to Frankfort, here they throttled back the engines, glided swiftly down through the anti-aircraft barrage and searchlights and released their bombs as accurately as possible. Then, after an almost vertical "bank" so sudden was the turn, Jock steered a straight course for the nearest point in the lines, which was considerably over one hundred miles away. Now the aviators had to face a strong head wind and steer straight into a rapidly approaching storm. The time taken to fly from Frankfort to the Rhine River, together with a change in drift, proved to the aviators that the wind had varied slightly in direction and had increased somewhat in velocity. They immediately decided not to lose time by climbing above the approaching storm, but to pass beneath it. This they did, and those aviators never went through a nastier experience than this homeward journey. Blinded and stung as they were by the downpour of rain, while their aeroplane was hurled about by the wind to such an extent that it appeared to be completely out of control, the voyage seemed interminable. The clouds above belched flashes of lightning in apparent unison with the Hun anti-aircraft batteries below. Held in the beams of the enemy's searchlights and plainly visible against the dark clouds above, Jock's plane was an easy target for the Hun gunners. But who can account for the fortunes of war? Jock brought his plane, riddled with shrapnel, into the moonlight beyond, showing up Kaiserlautern directly below, with its searchlights sweeping the sky while its anti-aircraft batteries filled the air with bursting shells; but in spite of this "hate" it was a pleasant sight to the aviators, for it showed them that their course was correct and that there was still time to gain the lines unless the wind increased. Again they passed below another dense bank of clouds, to experience again being blinded with the rain and shaken by the violence of the wind by which their plane was tossed about, all the while subjected to an attack by lightning from above and by anti-aircraft guns from below. It is a little trying to the nerves to fly for an hour without being able to see the earth beneath, and surrounded by the incessant flashings of lightning and the "whonkings" of bursting shells, but when homeward bound these little incidents are of minor import.