Ed's first notice of this was a rhythmic crashing outside the cabin. He managed to crawl to where he could see the gate he had built to block the hole into the other world. It was shaking from repeated batterings from the other side. Dragging his rifle with his good hand, he scrabbled down to where he could see through the chinks in the slab door. Two of the carrier units were there, taking turns slamming their full weight against it. He had built that gate skookum, but not to take something like that. He noted carefully where they were hitting it, then backed off twenty feet and laid the .450 across a log. He let them hit the door twice more to get the timing before he loosed off a shot, at the moment of impact. The battering stopped abruptly, and through the chinks he could see a bulk piled against the gate. For a while there was no more action. Then, after a few tentative butts at the door, the battering started again. This time, Ed wasn't so lucky. The battering stopped when he fired, but he got an impression that the carrier ran off. He thought he might have hit it, but not mortally. In an hour or so the Harn was back, and it kept coming back. Ed began to worry about his ammunition, which was not unlimited. Ordinarily, two or three boxes lasted him through the winter. He got his .30-06, for which he had a sugar sack full of military ammunition. The light full-patch stuff did not have the discouraging effect of the .450, though, and he had to shoot a lot oftener. Another thing, he wasn't getting any rest, which was bad in his already weakened condition. Every time he dozed off the battering would start again, and he would have to wake up and snap a few shots through the door. He held pretty much on one spot, not wanting to shoot the door to pieces, but the Harn noticed this, and started hitting the door in other places. The second day of the attack, the door came down. It had been pretty shaky for some time, and Ed had got the cabin ready for a siege, filling butter kegs with water and nailing up the windows. As the Harn poured through, he shot several and then broke for the cabin. A carrier ran at him full tilt, bent on bowling him over. Once off his feet, he would have been easy meat for one of the stingers. He sidestepped, swung his shotgun up in one hand--he had kept it handy for the close fighting--and blew the carrier's spine in half. He had to kick it aside to slam the cabin door. For a few minutes, then, things were pretty hectic. Ed went from one to another of the loopholes he had cut, blasting first with the shotgun as the Harn crowded around, then using the .30 as they grew more cautious. * * * * *