This advance looked as if nothing on earth, not even the lake of pitch, could ever stop it, and certain of the tribe started to flee. But Grom, after a moment of misgiving and hasty calculation, checked the flight sternly. He must, at all risks see the incredible thing that was about to happen. And he felt certain that, at this distance out upon the crust of the gulf, the tribe would be secure. The stupendous wave of dust and waving trunks and galloping black bulks thundered up at a terrific pace, and fell with irresistible impact upon the flank of the marching sambur. These unhappy beasts went down like grass before it. They were rolled flat, trodden out like a fire in thin grass, annihilated. And the screaming, trumpeting monsters, hardly aware that there had been an obstacle in their path, arrived at the edge of the canal. Here and there an old bull, leading, took alarm, trumpeted wildly, and strove to stop. But the belt of pitch was full to the brink with the packed bodies of the sambur, and did not look to be a very serious barrier to the spacious brown levels beyond it. Moreover, the panic of a long flight was upon them, and the rear ranks were thrusting them on. The trumpeting leaders were overborne in a twinkling. The ponderous feet of the front rank sank into the mass of bodies and horns and pitch, stumbled forward, belly deep, and strove to clamber out upon the solid-looking further edge. With trunks eagerly outstretched as if seeking to grip something, the huge, bat-eared heads heaved themselves up. The next moment the treacherous crust crumbled away beneath them like an eggshell, and with screams that tore the heavens they sank into the gulfs of pitch. The next two or three ranks went over on them, trod them deeper down, heaved and surged and battled for some moments along the edge of the crumbling crust. With mad trumpetings, they were themselves swallowed up in that sluggish, implacable flood. Here and there a black trunk, twisting in agony, lingered long, awful moments above the pitch. Here and there the pallid head of a giraffe, tongue protruding and eyes bursting from their sockets, stood up rigid on its long neck and screamed hideously. As the thick tide closed slowly, slowly over its prey, the hosts in the rear, having taken alarm at the agonized trumpetings, succeeded by a gigantic effort in checking their career. Those nearest the edge of doom reared up and fell back upon those next behind, to be ripped with frantic tusks in the mad confusion. But presently the whole colossal array brought itself to a halt, got itself turned to the left, and went thundering off on the trail of the sambur remnants.