The power ships of the two forces faced one another across ten miles of plain. Above the heads of each roved the tiny fighters, and above this cover, reaching up far into the realm of space, were rising the battlecraft. Planet forces began to move against one another, right through the unseen death that roved from the MacMillans on the tractors and the moving pillboxes. Space above the battleground filled with a continuously exploding roar, and sheets of released energy flares at the meeting points of crossed MacMillans. The constellation ships fenced momentarily, and then roared forward into full battle. The sluggers stood back and threw the might of their energy from long range. Tiny fighters raced forward, depending upon speed, mobility, and minuteness to escape the wary detector-coupled AutoMacs. Sight became impossible. The flaring of explosive and raw energy seared the eye that dared to look, and when the flaring light stopped by chance, the rising wreaths of smoke, steam, and incandescent vapor obscured the vision. Lightnings flashed in and through this cloud, and the instruments became wabbly. Fire ceased briefly, and both sides waited for the veil to clear. Technicians put the cancel plugs on ruined targets to clear them from further destruction, and turretmen served the heating projectors. A wave of sub-ships zoomed in and spread flaming death among the Terran forces, and the energy bombs poured up, and among the barrier-protected ships. A group of Martians holding disperser screens zoomed over, spreading energy in wide-aperture releases from their turrets. Bombs and torpedoes raced in through the disperser screens, and the blind crews died without knowing whether they had hit anything. Terran sub-ships crossed beneath the first wave of Martians, and hit the enemy. A veritable fence of exploding ships barred the view as sub-ships collided. Their indetectability was mutual, too. Like twin tornadoes, the ships of both worlds spun upwards in a vast, whirling spiral. Bits of dust, smoke, and vapor intermingled with the ships, giving them a definitely tornadolike appearance as they swept the surface of Mephisto towards each other. The volume between the twin vortices was torn and blasted. Slowly and ponderously they moved together, and as they intermingled in a whirling eddy of battle, the ground of Mephisto was scoured clean of life. The weight of Terra's forces carried the most momentum, and the spout moved across the territory formerly held by Mars. Reinforcements swooped in from space, and the whirling mass expanded. And with gathering speed, the vortex moved in an irregular path across Mephisto, sterilizing the planet as it went. Mephistans went before the tornado of huge battlecraft as straws go before a hurricane.