The Golden Age Of Science Fiction Vol Ix Part 19

Finally, a brief test-attack was made, with an entire fleet of one hundred s.h.i.+ps. They drew almost into position, faster than light, faster than the signaling warnings could send their messages. In position, all those great s.h.i.+ps strained and heaved at the mighty magnetic vortex that twisted at the field of the fort. Instantly, twelve of the fifteen-foot UV beams replied. And--two great UV beams of a size the Mirans had never seen before, beams from the two s.h.i.+ps, "S Doradus" and "Cepheid."

The test-attack dissolved as suddenly as it had come. The Mirans returned to Jupiter, and to the outer planets where they had further established themselves. Most of the Solar system was theirs. But the Solarians still held the choicest planets--and kept the Mirans from using the mild-temperatured Mars.

IX.

"They can't take this, at least," sighed McLaurin as they retreated from Luna.

"I didn't think they could--right away. I'm wondering though if they haven't something we haven't seen yet. Besides which--give them time, give them time."

"Well, give us time, too," snapped McLaurin. "How are you coming?"

Buck smiled. "I'm sure I don't know. I have a machine but I haven't the slightest idea of whether or not it's any good."

"Why not?"

"I can destroy--I hope--but I can't build up their ray. I can't test the machine because I haven't their ray to test it against."

"What can we do to test it?"

"The only thing I can see is to call for volunteers--and send out a six-man cruiser. If the s.h.i.+p's too small, they may not destroy it with the big crumbler rays. If it's too large--and the machine didn't work--we'd lose too much."

Twelve hours later, the IP men at the Lunar Bank fort were lined up. McLaurin stepped up on the platform, and addressed the men briefly, told them what was needed. Six volunteers were selected by a process of elimination, those who were married, had dependents, officers, and others were refused. Finally, six men of the IP were chosen, neither rookies nor veterans, six average men. And one average six-man cruiser, one hundred and eleven feet long, twenty-two in diameter. It was the T-208, a sister s.h.i.+p of the T-247, the first s.h.i.+p to be destroyed.

The T-208 started out from Luna, and with full acceleration, sped out toward Phobos. Slowly she circled the satellite, while distant scouts kept her under view. Lazily, the Miran patrol on Phobos watched the T-208, indifferent to her. The T-208 dove suddenly, after five fruitless circles of the tiny world, and with her four-foot UV beam flaming, stabbed angrily at a flight of Miran scouts berthed in the very shadow of a great battle cruiser, one of the interstellar s.h.i.+ps stationed here on Phobos.

Four of the little s.h.i.+ps slumped in incandescence. Angrily the terrific sword of energy slashed at the frail little scouts.

Angrily the Miran interstellar s.h.i.+p shot herself abruptly into action against this insolent cruiser. The cruiser launched a flight of the mercury-torpedoes. Flas.h.i.+ng, burning, ultra-violet energy flooded the great s.h.i.+p, harmlessly, for the men were, as usual, protected. The Miran answered with the neutron beam, atomic and gamma bombs--and the crumbler ray.

Gently, softly a halo of s.h.i.+mmering-violet luminescence built up about the T-208. The UV beam continued to flare, wavering slightly in its aim--then fell way off to one side. The T-208 staggered suddenly, wandered from her course--whole, but uncontrolled. For the men within the s.h.i.+p were dead.

Majestically the Miran swung along beside the dead s.h.i.+p, a great magnetic tow-cable shot out toward it, to shy off at first, then slowly to be adjusted, and take hold in the magnetic s.h.i.+eld of the T-208. The pilots of the watching scout-s.h.i.+ps turned away. They knew what would happen.

It did. Five--ten--twenty seconds pa.s.sed. Then the "dead-man" took over the s.h.i.+p--and the stored power in the atostor tanks blasted in a terrible flame that shattered the metal hull to molecular fragments. The interstellar cruiser shuddered, and rolled half over at the blasting pressure. Leaking seams appeared in her plates.

The scouts raced back to Luna as the Miran settled heavily, and a trifle clumsily to Phobos. Miran radio-beams were forcing their way out toward the Miran station on Europa, to be relayed to the headquarters on Jupiter, just as Solarian radio beams were thrusting through s.p.a.ce toward Luna. Said the Miran messages: "Their s.h.i.+ps no longer crumble." Said the Solarian messages: "The s.h.i.+ps no longer crumble--but the men die."

His deep eyes burning tensely, Buck Kendall heard the messages coming in, and rose slowly from his seat to pace the floor. "I think I know why," he said at last. "I should have thought. For that too can be prevented."

"Why--what in the name of the Planets?" asked McLaurin. "It didn't kill the men in the forts--why does it kill the men in the s.h.i.+ps, when the s.h.i.+ps are protected?"

"The protection kills them."

"But--but they had the protective oscillations on all the way out!" protested the Commander.

"Think how it works though. Think, man. The enemy's field is an electric-field oscillation. We combat it by setting up a similar oscillating field in the metal of the hull ourselves. Because the metal conducts the strains, they meet, and oppose. It is not a s.h.i.+eld--a s.h.i.+eld is impossible, as I have said, because of energy concentration factors. If their beam carried a hundred thousand horsepower in a ten-foot square beam, in every ten square feet of our s.h.i.+eld, we'd have to have one hundred thousand horsepower. In other words, hundreds of times as much energy would be needed in the s.h.i.+eld, as they used in their beam. We can't afford that. We had to let the beams oppose our oscillations in the metal, where, because the metal conducts, they meet on an equal basis. But--when two oscillations of slightly different frequency meet, what is the result?"

"In this case, a heterodyne frequency of a lower, and harmless frequency."

"So I thought. I was partly right. It does not harm the metal. But it kills the men. It is super-sonic. The terrible, shrill sounds destroy the cells of the men's bodies. Then, when their dead hands release the controls, the automatic switches blow up the s.h.i.+p."

"G.o.d! We stop one menace--and it is like the Hydra. For every head we lop off, two spring up."

"Ah--but they are lesser heads. Look, what is the fundamental difference between sound and light?"

"One is a vibration of matter and the--ah--eliminate the material contact!"

"Exactly! All we need to do is to let the s.h.i.+ps operate airless, the men in s.p.a.ce suits. Then the air cannot carry the sounds to them. And by putting special damping materials in their suits, we can stop the vibrations that would reach them through their feet and hands. Another six-man s.h.i.+p must go out--but this s.h.i.+p will come back!"

And with the order for another experimental s.h.i.+p, went the orders for commercial supplies of this new apparatus. Every IP s.h.i.+p must be equipped to resist it.

Buck Kendall sailed on the six-man scout that went out this time. Again they swooped once at Phobos, again Miran scout-s.h.i.+ps crumbled under the attack of the vicious UV beams. The Mirans were not waiting contemptuously this time. In an instant the great interstellar s.h.i.+p rose from its berth, its weapons working angrily. The crumbler ray snapped out at the T-253.

Kendall stared into the periscope visor intently. Clumsily his padded hands worked at the specially adapted controls. The soft hiss of the oxygen release into his suit disturbed him slightly. The radio-phones in his helmet carried all the conversations in the s.h.i.+p to him with equal clarity. He watched as the great s.h.i.+p angled angrily up-- His vision was momentarily obscured by a violet glow that built up and reached out gently from every point of metal in the s.h.i.+p. The instant Kendall saw that, the T-253 was fleeing under his hands. The test had been made. Now all he desired was safety again. The ion-rockets flared recklessly as, crushed under an acceleration of four Earth-gravities, he sank heavily into his seat. Grimly the Miran s.h.i.+p was pursuing them, easily keeping up with the fleeing midget. The crumbler became more intense, the violet glow more vivid.

The UV beam was reaching out directly behind now. The-- With a cry of agony, Kendall ripped the radio-phone connection out of his suit. A soft hiss of leaking air warned him of too great violence only minutes later. For his ears had been deafened by the sudden shriek of a tremendous signal from outside!

Instantly Kendall knew what that meant. And he could not communicate with his men! There was no metal in these special suits, even the oxygen tanks were made of synthetic plastics of tremendous strength. No sc.r.a.p of vibrating metal was permissible. The padded gloves and boots protected him--but there was a new and different type of crackle and haze from the metal points now. It was almost invisible in the practically airless s.h.i.+p, but Kendall saw it.

Presently he felt it, as he desperately increased his acceleration. Slow creeping heat was attacking him. The heat was increasing rapidly now. Desperately he was working at the crumbler-protection controls--but immediately set them back as they were. He had to have the crumbler protection as well--!

Grimly the great Miran s.h.i.+p hung right beside them. Angrily the two four-foot UV beams flashed back--seeking some weak spot. There were none. At her absolute maximum of acceleration the little s.h.i.+p plunged on. Gamma and atomic bombs were was.h.i.+ng her in flame. The heavy blocks of paraffin between her walls were long since melted, retained only by the presence of the metal walls. Smoke was beginning to filter out now, and Kendall recognized a new, and deadlier menace! Heat--quant.i.ties of heat were being poured into the little s.h.i.+p, and the neutron guns were doing their best to add to it. The paraffin was confined in there--and like any substance, it could be volatilized, and as a vapor, develop pressure--explosive pressure!

The Miran seemed satisfied in his tactics so far--and changed them. Forty-seven million miles from Earth, the Miran simply accelerated a bit more, and crowded the Solarian s.h.i.+p a bit. White-faced, Buck Kendall was forced to turn a bit aside. The Miran turned also. Kendall turned a bit more-- Flas.h.i.+ng across his range of vision at an incredible speed, a tiny thing, no more than twenty feet long and five in diameter, a scout-s.h.i.+p appeared. Its tiny nose ultra-violet beam was blasting a solid cylinder of violet incandescence a foot across in the hull of the Miran--and, to the Miran, angling swiftly across his range of vision. Its magnetic field clashed for a thousandth of a second with the T-253, instantly meeting, and absorbing the fringing edges. Then--it swept through the Miran's magnetic s.h.i.+eld as easily. The delicate instruments of the scout instantaneously adjusted its own magnetic field as much as possible. There was resistance, enormous resistance--the s.h.i.+p crumpled in on itself, the tail vanished in dust as a sweeping crumbler beam caught it at last--and the remaining portion of the s.h.i.+p plowed into the nose of the Miran.

The Miran's force-control-room was wrecked. For perhaps a minute and a half, the s.h.i.+p was without control, then the control was re-established--and in vain the telescopes and instruments searched for the T-253. Lightless, her rockets out now, her fields damped down to extinction, the T-253 was lost in the pulsing, gyrating fields of half a dozen scout-s.h.i.+ps.

Kendall looked grimly at the crushed spot on the nose of the Miran. His s.h.i.+p was drifting slowly away from the greater s.h.i.+p. Presently, however, the Miran put on speed in the direction of Earth, and the T-253 fell far behind. The Miran was not seriously injured. But that scout pilot, in sacrificing life, had thrown dust in their eyes for just those few moments Kendall had needed to lose a lightless s.h.i.+p in lightless s.p.a.ce--lightless--for the Mirans at any rate. The IP s.h.i.+ps had been covered with a black paint, and in no time at all, Kendall had gotten his s.h.i.+p into a position where the energy radiations of the sun made him undetectable from the Miran's position, since the radiation of his own s.h.i.+p, even in the heat range, was mingled with the direct radiation of the sun. The sun was in the Miran's "eyes," both actual and instrumental.

An hour later the Miran returned, pa.s.sed the still-lightless s.h.i.+p at a distance of five million miles, and settled to Phobos for the slight repairs needed.

Twelve hours later, the T-253 settled to Luna, for the many rearrangements she would need.

"I rather knew it was coming," Kendall admitted sadly, "but danged if I didn't forget all about it. And--cost the life of one of the finest men in the system. Jehnson's family get a permanent pension just twice his salary, McLaurin. In the meantime--"

"What was it? Pure heat, but how?"

"Pure radio. Nothing but short-wave radio directed at us. They probably had the apparatus, knew how to make it, but that's not a good type of heat ray, because a radio tube is generally less than eighty percent efficient, which is a whale of a loss when you're working in a battle, and a whale of an inconvenience. We were heated only four times as much as the Miran. He had to pump that heat into a heat-reservoir--a water tank probably--to protect himself. Highly inefficient and ineffective against a large s.h.i.+p. Also, he had to hold his beam on us nearly ten minutes before it would have become unbearable. He was again, trying to kill the men, and not the s.h.i.+p. The men are the weakest point, obviously."

"Can you overcome that?"

"Obviously, no. The thing works on pure energy. I'd have to match his energy to neutralize it. You knew it's an old proposition, that if you could take a beam of pure, monochromatic light and divide it exactly in half, and then recombine it in perfect interference, you'd have annihilation of energy. Cancellation to extinction. The trouble is, you never do get that. You can't get monochromatic light, because light can't be monochromatic. That's due to the Heisenberg Uncertainty--my pet bug-bear. The atom that radiates the light, must be moving. If it isn't, the emission of the light itself gives it a kick that moves it. Now, no matter what the quantum might have been, it loses energy in kicking the atom. That changes the situation instantly, and incidentally the 'color' of the light. Then, since all the radiating atoms won't be moving alike, etc., the ma.s.s of light can't be monochromatic. Therefore perfect interference is impossible.

"The way that relates to the problem in hand, is that we can't possibly destroy his energy. We can, as we do in the crumbler stunt, change it. He can't, I suspect, put too much power behind his crumbler, or he'd have crumbling going on at home. We get a slight heating from it, anyway. Into the bargain, his radio was after us, and his neutrons naturally carried energy. Now, no matter what we do, we've got that to handle. When we fight his crumbler, we actually add heat-energy to it, ourselves, and make the heating effect just twice as bad. If we try to heterodyne his radio--presto--it has twice the heat energy anyway, though we might reduce it to a frequency that penetrated the s.h.i.+p instead of all staying in it. But by the proposition, we have to use as much energy, and in fact, remember the 80% rule. We've got to take it and like it."

"But," objected McLaurin, "we don't like it."

"Then build s.h.i.+ps as big as his, and he'll quit trying to roast you. Particularly if the inner walls are synthetic plastics. Did you know I used them in the 'S Doradus' and 'Cepheid'?"

"Yes. Were you thinking of that?"

"No--just luck--and the fact that they're light, strong as steel almost, and can be manufactured in forms much more quickly. Only the outer hull is tungsten-beryllium. The advantage in this will be that nearly all the energy will be absorbed outside, and we'll radiate pretty fast, particularly as that tungsten-beryllium has a high radiation-factor in the long heat range."

"What does that mean?"

"Well, ordinary polished silver is a mighty poor radiator. Homely example: Try waiting for your coffee to cool if it's in a polished silver pot. Then try it in a tungsten-beryllium pot. No matter how you polish that tungsten-beryllium, the stuff WILL radiate heat. That's why an IP s.h.i.+p is always so blamed cold. You know the pa.s.senger s.h.i.+ps use polished aluminum outer walls. The big help is, that the tungsten-beryllium will throw off the energy pretty fast, and in a big s.h.i.+p, with a whale of a lot of matter to heat, the Strangers will simply give up the idea."

"Yes, but only two s.h.i.+ps in the system compare with them in size."

"Sorry--but I didn't build the IP fleet, and there are lots of tungsten and beryllium on Earth. Enough anyway."

"Will they use that beam on the fort? And can't we use the thing on them?"

"They won't and we won't--though we could. A bank of those new million watt tubes--perhaps a hundred of them--and we'd have a pretty effective heater--but an awful waste of power. I've got something better."

"New?"

"Somewhat. I've found out how to make the mirror field in a plate of metal, instead of a block. Come on to the lab, and I'll show you."

"What's the advantage? Oh--weight saved, and silver metal saved."

"A lot more than that, Mac. Watch."

At the laboratory, the new apparatus looked immensely lighter and simpler than the old. The atostor, the ionizer, and the twin ion-projectors were as before, great, rigid, metal structures that would maintain the meeting point of the ions with inflexible exact.i.tude under any acceleration strains. But now, instead of the heavy silver block in which a mirror was figured, the mirror consisted of a polished silver plate, parabolic to be sure, but little more than a half-inch in thickness. It was mounted in a framework of complex, stout metal braces.

Kendall started the ion-flame at low intensity, so the UV beam was little more than a spotlight.

"You missed the point, Mac. Now--watch that tungsten-beryllium plate. I'll hold the power steady. It's an eighteen-inch beam--and now the energy is just sufficient to heat that tungsten plate to bright red. But--"

Kendall turned over a small rheostat control--and abruptly the eighteen-inch diameter spot on the tungsten-beryllium plate began contracting; it contracted till it was a blazing, sparkling spot of molten incandescence less than an inch across!

"That's the advantage of focus. At this distance of a few hundred feet with a small beam I can do that. With a twenty-foot beam, I can get a two-foot spot at a distance of nearly ten miles! That means that the receiving end will have the pleasure of handling one hundred times the energy concentration. That would punch a hole through most anything. All you have to do is focus it. The trouble being, if it's out of focus the advantage is more than lost. So if there's any question about getting the focus, we'll get along without it."

"A real help, if you do. That would punch a hole before the Stranger s.h.i.+p could turn away as they do now."

Kendall nodded. "That's what I was after. It is mainly for the forts, though. We'll have to signal the dope to the Mars Center and Deenmor stations. They can fix it up, themselves. In the meantime--all we can do is hold on and hunt, and let's hope better than the Strangers do."

X.

Sadly the convalescent Gresth Gkae listened to the reports of his lieutenants. More and more disgraced he felt as he realized how badly he had blundered in reporting the people of this system unable to cope with the attackers' weapons. Gresth Gkae looked up at his old friend and physician, Merth Skahl. He shook his head slowly. "I'm afraid, Merth Skahl. I am afraid. We have, perhaps, made a mistake. The better and the stronger alone should rule. Aye, but is the stronger always the better? I am afraid we have mistaken the Truth in a.s.suming this. If we have--then may Jarth, Lord of Truth and Wisdom punish us. Mighty Jarth, if I have mistaken in following my judgments, it is not from disobedience, it is lack of Thy knowledge. The strongest--they are not always the better, are they?"

Merth Skahl bent sharply over his friend. "Quiet thyself, Gresth Gkae. You know, and I know, you have done only your best, and surely Jarth himself can ask no better of any one. You must rest, for only by rest can those terrible burns be healed. All your stheen over half the body-area was burned off. You have been delirious for many days."

"But Merth Skahl, think--have we disobeyed Jarth's will? It is, we know, his will that only the best and the strongest shall rule--but are the best always the strongest? An imbecile adult could destroy the life of a genius-grade child. The strongest wins, but not the best. Such would not be the will of Jarth. If we be the stronger, and the best, then it is right and just that these strange creatures should be destroyed that we may have a stable world of stable light and heat. But look and see, with what terrible swiftness these strange creatures have learned! May it not be they are the better race--that it is we who are the weaker and the poorer? Can it be that Jarth has brought us together that these people might learn--and destroy us? If they be the stronger, and the better--then may Jarth's will be done. But we must test our strength to the utmost. I must rise, and go to my laboratory soon. They have set it up?"

"Aye, they have, Gresth Gkae. But remember, the weak and the sick make faults the strong and the well do not. Better that you rest yourself. There is little you can do while your body seeks to recover from these terrible burns."

"You are wrong, my friend, wrong. Don't you see that my mind is clear--that it is the mind which must fight in these battles, for surely the man is weak against such things as this infra-X-radiation? Why, I am better able to fight now than are you, for I am a trained fighter of the mind, while you are a trained healer of the body. These strange beings with their stiff arms and legs, their tender skins, and--and their swift minds have fought us all too well. If we must test, let it be a test. I have heard how they so quickly solved the riddle of the crumbling field. That took us longer, and we designed it. The Counsel of Worlds put me in command, let me up, Skahl, I must work."

Concerned, the physician looked down at him. Finally he spoke again. "No, I will not permit you to leave the hospital-s.h.i.+p. You must stay here, but if, as you have said, the mind is what must fight, then surely you can fight well from here, for your mind is here."

"No, I cannot, and you well know it. I may shorten my life, but what matter. 'Death is the end toward which the chemical reaction, Life, tends,'" quoted the scientist. "You know I have left my children--my immortality is a.s.sured through them. I can afford to die in peace, if it a.s.sures their welfare. Time is precious, and while my mind might work from here, it must have data on which to work. For that, I must go to the laboratories. Help me, Merth Skahl."

Reluctantly the physician granted the request, but begged of Gresth Gkae a promise of at least six hours rest in every fifteen, and a good sleep of at least twenty-seven hours every "night." Gresth Gkae agreed, and from a wheelchair, conducted his work, began a new line of experimentation he hoped would yield them the weapon they needed. Under him, the staff of scientists worked, aiding and advising and suggesting. The apparatus was built, tested, and found wanting. Time and again as the days pa.s.sed, they watched Gresth Gkae, gaining strength very, very slowly, taken away despondent at the end of his forty hours of work.

A dozen expeditions were sent to Jupiter's poles to watch and measure and study the tremendous auroral displays there, where Jupiter's vast magnetic field sucked in countless quintillions of the flying electrons from the sun, and brought them circling in, in a vast, magnificent display of auroral ionization.

Expeditions went to the great Southern Plateau, the Plateau of Storms, where the t.i.tanic air currents resulted in an everlasting display of terrific lightnings, great burning b.a.l.l.s of electric force floating dangerous and deadly across the frozen, ultra-cold plain.

And the expeditions brought back data. Yet still Gresth Gkae could not sleep, his thoughts intruding constantly. Hours Merth Skahl spent with him, calming him to sleep.

"But what is this constant search? It is little enough I know of science, but why do you send our men to these spots of wonderfully beautiful, but useless natural forces. Can we somehow, do you think, turn them against the people of these worlds?"

Softly the old Miran smiled. "Yes, you might say so. For look, it is the strange b.a.l.l.s of electric force I want to know about. Sthor had few, but occasionally we saw them. Never were they properly investigated. I want to know their secret, for I am sure they are b.a.l.l.s of electric forces not vastly dissimilar from the nucleus of the atom. Always we have known that no system of purely electrical forces could remain stable. Yet these strange b.a.l.l.s of energy do. How is it? I am sure it will be of vast importance. But the direct secret I hope to learn is in this: What can be done with electric fields can nearly always be duplicated, or paralleled in magnetic fields. If I can learn how to make these electric b.a.l.l.s of energy, can I not hope to make similar magnetic b.a.l.l.s of energy?"

"Yes, I see--that would seem true. But what benefit would you derive from that? You have magnetic beams now, and yet they are useless because you can get nowhere near the forts. How then would these benefit you?"

"We can do nothing to those forts, because of that magnetic s.h.i.+eld. Could we once break it down, then the fort is helpless, and one or two small atomic bombs destroy it. But--we cannot stay near, for the terrible infra-X-rays of theirs burn holes in our s.h.i.+ps, and--in our men.

"But look you, I can drop many atomic bombs from a distance where their beams are ineffective. Suppose I do make a magnetic ball of energy, a magnetic bomb. Then--I can drop it from a distance! We have learned that the power supply of these forts is very great--but not endless, as is ours now, thanks to the vast supplies of power metal on this heavy planet. Then all we need do is stay at a distance where they cannot reach us--and drop magnetic bombs. Ah, they will be stopped, and their energy absorbed. But we can keep it up, day after day, and slowly drain out their power. Then--then our atomic bombs can destroy those forts, and we can move on!" But suddenly the animation and strength left his voice. He turned a sad, downcast face to his friend. "But Merth Skahl, we can't do it," he complained.

"Ah--now I can see why you so want to continue this wearing and worrying work. You need time, Gresth Gkae, only time for success. Tomorrow it may be that you will see the first hint that will lead you to success."

"Ah--I only hope it, Merth Skahl, I only hope it."

But it was the next day that they saw the first glimpse of the secret, and saw the path that might lead to hope and success. In a week they were sending electric bombs across the laboratory. And in three days more, a magnetic bomb streaked dully across the laboratory to a magnetic s.h.i.+eld they had set up, and buried itself in it, to explode in brilliant light and heat.

From that day Gresth Gkae began to mend. In the three weeks that were needed to build the apparatus into s.h.i.+ps, he regained strength so that when the first flight of five interstellar s.h.i.+ps rose from Jupiter, he was on the flags.h.i.+p.

To Phobos they went first, to the little inner satellite of Mars, scarcely eight miles in diameter, a tiny bit of broken metal and rock, utterly airless, but scarcely more than 3700 miles from the surface of Mars below. The Mars Center and Deenmor forts were wasting no power raying a s.h.i.+p at that distance. They could, of course, have damaged it, but not severely enough to make up for the loss of their strictly limited power. The photocells had been working overtime, every minute of available light had been used, and still scarcely 2100 tons of charged mercury remained in the tanks of Mars Center and 1950 in the tanks at Deenmor.

The flight of five s.h.i.+ps settled comfortably upon Phobos, while the three relieved of duty started back to Jupiter. Immediately work was begun on the attack. The s.h.i.+ps were first landed on the near side, while the apparatus of the projectors was unloaded, then the great s.h.i.+ps moved around to the far side. Phobos of course rotated with one face fixed irrevocably toward Mars itself, the other always to the cold of s.p.a.ce. Great power leads trailed beneath the s.h.i.+ps, and to the dark side. Then there were huge water lines for cooling. On this almost weightless world, where the great s.h.i.+ps weighing hundreds of thousands of tons on a planet, weighed so little they were frequently moved about by a single man, the laying of five miles of water conduit was no impossibility.

Then they were ready. Mars Center came first. Automatic devices kept the aim exact, as the first of the magnetic bombs started down. At five-second intervals they were projected outward, invisible globes of concentrated magnetic energy, undetectable in s.p.a.ce. Seven seconds pa.s.sed before the first became dimly visible in the thin air of Mars. It floated down, it would miss the fort it seemed--so far to one side-- Abruptly it turned, and darted with tremendously accelerating speed for the great magnetic field of the fort. With a vast blast of light, it exploded. Five seconds later a second exploded. And a third.

Mars Center signaled scoffingly that the bombs were all being stopped dead in the magnetic atmosphere, after the bombardment had been witnessed from Earth and Luna. An hour later they gave a report that they were concentrated magnetic fields of energy that would be rather dangerous--if it weren't that they couldn't even stand into the magnetic atmosphere. Three hours later Mars Center reported that they contained considerably more energy than had at first been thought. Further, which they had not carefully considered at first, they were taking energy with them! They were taking away about an equal amount of energy as each blew up.

It was only a half-hour after that that the men at Mars Center realized perfectly what it meant. Their power was being drained just a little bit better than twice as fast as they generated during the day--and since Phobos spun so swiftly across the sky.

Deenmor got the attack just about the time Mars Center was released. Deenmor immediately began seeking for the source of it. Somewhere on Phobos--but where?