As the automobile approached the British line, an officer, with several men, advanced with a command "Halt." Hal obeyed, and leaped lightly from the car.
He identified himself to the satisfaction of the British officer, and Hal swung the car sharply south, heading for the distant American sector of the battle front.
They were forced to go more slowly now, as the ground came to life with soldiers, so it was almost noon when they came in sight of that section of the field where the American troops were quartered.
Leaving McKenzie and Stubbs in the car, Hal and Chester made their way to the headquarters of General Pershing. They were admitted immediately.
"Back so soon?" exclaimed General Pershing, getting to his feet. "I was afraid—"
From his pocket Hal produced the list of German spies in America.
"Here, sir," he said quietly, "is the list."
General Pershing snatched it away from him and scanned it hastily.
Then, turning to the lads, he said very quietly:
"You have done well, sirs. Your work shall be remembered. You will both kindly make me written reports of your mission."
He signified that the interview was at an end. Hal and Chester saluted, and left their commander's quarters.