going through. All he had to do was wait.

The plank bridge groaned under them, almost touching the water in the moat. Most ingenious, that moat. The Nahali could swim it in their sleep, normally, but when the conductor rods along the bottom were turned on, they literally burned out their circuits from an overload. The swamp-rats packed a bigger potential than any Earthly electric eel.

Ian MacIan, looking at the lights of the squalid village that lay below the fort, reflected that the Nahali had at least one definitely human trait. The banging of a three-tiered Venusian piano echoed on the heavy air, along with shouts and laughter that indicated a free flow of "swamp juice." This link in the chain of stations surrounding the swamplands was fully garrisoned only during the rains, and the less warlike Nahali were busy harvesting what they could from the soldiers and the rabble that came after them.

Queer creatures, the swamp-rats, with their ruby eyes and iridescent scales. Nature, in adapting them to their wet, humid environment, had left them somewhere between warm-blooded mammals and cold-blooded reptiles, anthropoid in shape, man-sized, capricious. The most remarkable thing about them was their breathing apparatus, each epithelial cell forming a tiny electrolysis plant to extract oxygen from water. Since they lived equally on land and in water, and since the swamp air was almost a mist, it suited them admirably. That was why they had to wait for the rains to go raiding in the fertile uplands; and that was why hundreds of Interworld Legionnaires had to swelter on the strip of soggy ground between swamp and plateau to stop them.

MacIan was last in line. Just as his foot left the planks, four heads jerked up as one, facing to the darkening sky.

"Rain!"

Big drops, splattering slowly down, making a sibilant whisper across the swamp. The pipes broke off, leaving the ears a little deafened with the lack of them after so long. And MacIan, looking at Lehn, swore furiously in his heart.

The three men paused, expecting an order to turn back, but Lehn waved them on.

"But it's raining," protested Bhak. "Well get caught in the attack."

The officer's strangely hard face was turned toward them. "No," he said, with an odd finality, "they won't attack. Not yet."

They went on, toward the 

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