the old Frenchman. "It has found them out; it knows what is going on here."
He guessed rightly that this information would swiftly change the course of events. Everything which had been happening in the early morning hours was going to sink into insignificance compared with what was coming now. He shuddered with fear, the irresistible fear of the unknown, and yet at the same time he was filled with curiosity, impatience and nervous dread before a danger that threatened and would not stay its relentless course.
Outside the park, but a short distance from the mud wall, sounded a strident explosion like a stupendous blow from a gigantic axe—an axe as big as his castle. There began flying through the air entire treetops, trunks split in two, great chunks of earth with the vegetation still clinging, a rain of dirt that obscured the heavens. Some stones fell down from the wall. The Germans crouched but with no visible emotion. They knew what it meant; they had been expecting it as something inevitable after seeing the French aeroplane. The Red Cross flag could no longer deceive the enemy's artillery.
Don Marcelo had not time to recover from his surprise before there came a second explosion nearer the mud wall … a third inside the park. It seemed to him that he had been suddenly flung into another world from which he was seeing men and things across a fantastic atmosphere which roared and rocked and destroyed with the violence of its reverberations. He was stunned with the awfulness of it all, and yet he was not afraid. Until then, he had imagined fear in a very different form. He felt an agonizing vacuum in his stomach. He staggered violently all the time, as though some force were pushing him about, giving him first a blow on the chest, and then another on the back to straighten him up.
A strong smell of acids penetrated the atmosphere,
