They glanced over their shoulders and saw two of the orderlies executing a fox-trot in the heavy shell-ploughed soil.

“What's the row?” inquired the Australian.

“Why, my dear chap,” replied the M. O., “don't you know we have never seen a gun in action in the open that way. Our guns operated only from holes and corners, from hedges and cellars. Otherwise they'd be spotted and knocked out in an hour.”

“Ow!” said the Australian, “our bird men attended to that the first dye of the fight. They sye there was a double line of observation balloons along the lines, ours and theirs up to the 30th of June. The next morning not a Boche balloon was to be seen. Our plynes put their eye out in a single afternoon. Since that time, we hold over them in the air. Ah! There are the heavies coming up now. The full chorus will be on in half a minute.”

A few seconds later, the truth of the Australian's prophecy was demonstrated. The full chorus was on. For two hours the barrage raged, and the din was such that they had to shout in each other's ears to be heard. The hilltops were ringed with darting tongues of red flame as though belched out by a thousand fabled dragons. It was as if the air above was filled with millions of invisible demons, whining, moaning, barking, shrieking in a fury of venomous hate, while at regular intervals came the express train roar of the twelve, fifteen and sixteen inch guns.

“It's almost worth while to have lived through those months in The Salient,” said Barry, “to get the full enjoyment of this experience. Well do I remember the day when our O. C. asked for 'retaliation,' and was told he could have six rounds, I think it was, or eight. Meanwhile our trenches and dug-cuts were going up in bloody mud.”

“I think we might as well go below,” said the Australian. “They will be coming in presently.”

But Barry and the M. O. remained long after the first coming in shells began to drop around. That barrage so long waited for, and so ardently desired, was worth some risk.

Soon the wounded began to arrive, and throughout the whole night, the M. O. and his staff were busy at their work. On the arrival of the zero hour, the barrage lifted.

“Well, good luck go with the boys,” said the Australian, fervently. “They are out and over now. We'll get some of them presently.”