Conan bent over the victim of the attack, but the man was already dead. No one spoke; useless to comment on the fact that never before had a hawk been known to swoop on a man. Red rage began to vie with fatalistic lethargy in the wild souls of the Irakzai. Hairy fingers nocked arrows and men glared vengefully at the tower whose very silence mocked them. But the next attack came swiftly. They all saw it--a white puffball of smoke that tumbled over the tower-rim and came drifting and rolling down the slope toward them. Others followed it. They seemed harmless, mere woolly globes of cloudy foam, but Conan stepped aside to avoid contact with the first. Behind him one of the Irakzai reached out and thrust his sword into the unstable mass. Instantly a sharp report shook the mountainside. There was a burst of blinding flame, and then the puffball had vanished, and the too-curious warrior remained only a heap of charred and blackened bones. The crisped hand still gripped the ivory sword-hilt, but the blade was gone--melted and destroyed by that awful heat. Yet men standing almost within reach of the victim had not suffered except to be dazzled and half blinded by the sudden flare. 'Steel touches it off,' grunted Conan. 'Look out--here they come!' The slope above them was almost covered by the billowing spheres. Kerim Shah bent his bow and sent a shaft into the mass, and those touched by the arrow burst like bubbles in spurting flame. His men followed his example and for the next few minutes it was as if a thunderstorm raged on the mountain slope, with bolts of lightning striking and bursting in showers of flame. When the barrage ceased, only a few arrows were left in the quivers of the archers. They pushed on grimly, over soil charred and blackened, where the naked rock had in places been turned to lava by the explosion of those diabolical bombs. Now they were almost within arrow-flight of the silent tower, and they spread their line, nerves taut, ready for any horror that might descend upon them. On the tower appeared a single figure, lifting a ten-foot bronze horn. Its strident bellow roared out across the echoing slopes, like the blare of trumpets on Judgment Day. And it began to be fearfully answered. The ground trembled under the feet of the invaders, and rumblings and grindings welled up from the subterranean depths. The Irakzai screamed, reeling like drunken men on the shuddering slope, and Conan, eyes glaring, charged recklessly up the incline, knife in hand, straight at the door that showed in the tower-wall. Above him the great horn roared and bellowed in brutish mockery. And then Kerim Shah drew a shaft to his ear and loosed.