Instantly all four Americans were craning their necks at the windows. High in the air, the French aircraft in flight looked as graceful as swallows on the wing.

"They are battleplanes," explained Captain Ribaut further. "Some of the Hun flyers are almost sure of a tumble this afternoon."

When the American party alighted at the last station on the line, and looked back, they beheld long trains of freight cars coming slowly along. The train from which they had descended was hauled out and quickly shunted out of the way on a siding. The freight trains pulled in, going to various sidings before huge warehouses in which the food and fighting supplies were stored until wanted closer to the front. It was a scene of deafening noise and what looked like indescribable confusion. Yet everything moved according to a plan.

"Let us come where we can hear our own voices!" shouted Captain Ribaut in the major's ear, and led the way. Behind the station they found a limousine car awaiting them. As there were seats for five inside, the travelers soon found themselves vastly more comfortable than they had been on the train.

"We will drive slowly," said Captain Ribaut, after he had given his orders to a soldier chauffeur, "for one does not usually go into the trenches until after dark. There will be plenty to see on the way, and enough to talk about."

At one point Captain Ribaut directed the soldier-driver to turn the machine into a field. Here the Americans alighted to see seemingly endless streams of French "camions" go by. These are heavy motor trucks that carry supplies to the front.

"And here come some vehicles from the front that tell their own story," spoke Captain Ribaut rather sadly.

In another moment the first of a string of at least half a hundred small cars went by at rapid speed toward the rear. Each car bore the device of the Red Cross.

"There has been disagreeable work, and our wounded are going back," explained Captain Ribaut. "But my friends," he cried suddenly, "I congratulate you on what you are privileged to see. These are not our French ambulances, but some of your own cars, given to France, and young men from America are driving them."

That these were American ambulance sections in French service there could be no doubt, for as the drivers caught sight of the American uniforms they offered informal salutes in high glee. It was reserved for one gleeful young American, however, to call out, as his ambulance whizzed by: