At the third line trench they found sentries of the reserves on duty.
"The rest of the reserves are sleeping," Ribaut explained.

"You will see their dug-out entrances as we pass along this trench, for I am taking you to the quarters of the battalion commander." It was necessary to proceed along this third line trench for nearly a quarter of a mile before they came to a dug-out entrance before which a sentry and two runners crouched on the ground.
"Captain Ribaut and American officers present their compliments, and would see Major Ferrus," explained Ribaut.
A runner entered the underground shelter, speedily returning and signing to the visitors to descend the steps.

Dick and his friends found themselves in an underground room of about eight by twelve.
Around the walls were several bunks.

At a table, which held a telephone instrument, sat Major Ferrus and two junior officers.
"It is quiet here, after the Hun assault of this afternoon," explained the French major when the Americans had been presented.

"Captain Ribaut, you are taking our American comrades to the front line ?" "That is my instruction, Major." "It is well, and I think you will find it quiet enough to-night for a study of the Hun line.