A huge shell passed screaming over their heads and burst far beyond them. But they did not jump. They had heard so much sound of cannon that day that their ears were dulled by it.

"It's evident that they haven't given up hope of cutting us off," said Wharton, "since they push the pursuit in the night."

"And they'll be at it again as hard as ever in the morning," said John. "We'll see those horns of the crescent still pushing forward. They mean to get us. They mean to smash up everything here in a month, and then go back and get Russia."

The firing went on until long past midnight. Toward morning they slept a little in a field, but when day came they saw the gray masses still in pursuit. All day long the terrible retreat went on, the defense fighting fiercely, but slowly withdrawing, the Germans pressing hard, and always seeking to envelop their flanks. There was continual danger that the army would be lost, but no dismay. Cool and determined the defense never relaxed, and all the time bent to the right to get in touch with the French who were retreating also.

It was a gloomy day for John. Like most Americans his feeling for France had always been sympathetic. France had helped his own country in the crisis of her existence, and France was a free republic which for a generation had strictly minded its own business. Yet this beautiful land seemed destined to be trodden under foot again by the Germans, and the French might soon cease to exist as a great nation. French and English together had merely checked the German host for a few hours. It had swept both out of its way and was coming again, as sure and deadly as ever.

They did not hear until the next day that the French and English armies were already in touch, and while still driven back it was not probable that they could be cut apart, and then be surrounded and destroyed in detail. John felt a mighty joy. That crisis in the world's history had passed and by the breadth of a hair the military autocracy had missed its chance. Yet what the German hour had failed to bring might come with slow time, and his joy disappeared as they were driven back farther and farther into France. Thus the retreat continued for days and nights.

Carstairs was the most cheerful of the three. They had slipped from the trap, and, as he saw it, England was merely getting ready for a victory.

"You wait until our second army comes up," he said, "and then we'll give the Germans a jolly good licking."

"When is it coming up?" asked John. "In this century or the next?"

"Be patient. You Yankees are always in too much of a hurry."