After walking about a mile, they came to a regiment encamped in a field beside the road. The lieutenant led his prisoners to the commanding officer, and explained the circumstances of their capture.

"You say you are English?" he said, scanning the two men.

"I assure you that is the truth," replied Granger. "We were both arrested as spies in Cologne, but by an ingenious stratagem of my friend here we obtained possession of a German aeroplane, and are delighted to find ourselves in Belgian territory, among a friendly people."

"You speak very good French."

"Which is not to our discredit, I hope," said Granger with a smile.

The Colonel was plainly even more incredulous than his subordinate. A man who spoke such good French must be a German spy! He took up the receiver of a field telephone. Ascertaining that an aide de camp was at the other end of the wire he said:

"Two men, one in police, the other in military uniform, German, have landed from a Taube monoplane west of Liers. They say they are English, but they are clearly German spies. I await orders."

The prisoners, who had heard all, watched his face grimly set as he held the receiver to his ear.

"It's extraordinary, the persistence of a fixed idea," said Granger in a low tone to Kenneth. "If he heard us speaking English I suppose he would take it as a clinching proof that we are Germans! The uniforms, our salvation in Cologne, are here our damnation."

"They'll send us to the General, won't they? He won't be such an ass."