The rampart was crowned with a stockade of sharpened logs. A furlong. Two hundred and twenty yards. Four sides—No, from the lay of the land Shef realized suddenly that one side of the camp was bounded here by the river Stour. On that side he could even see prows projecting into the sluggish stream. He was puzzled—until he realized that the Vikings must have pulled their ships, their most precious possessions, up on the mudflats there, then grappled them together so that they themselves formed one wall of the enclosure. Big. How big? Three sides. Three times two hundred and twenty yards. Each log in the stockade maybe a foot wide. Three feet to a yard.

Shef’s mind, as it so often did, tried to grapple with the problem of numbers. Three times three times two hundred and twenty. There must be a way to know the answer to that, but this time Shef could see no shortcut to finding it. It was a lot of logs, anyway, and big ones too, cut from trees hard to find down here on the flats. They must have brought the logs with them. Dimly, Shef began to discover an unfamiliar notion. He knew no word for it. Making plans, perhaps. Planning ahead. Thinking things out before they happened. No detail was too small for these men to trouble with. He suddenly realized that they did not think war was only a matter of the spirit, of glory and speeches and inherited swords. It was a trade, a matter of logs and spades, preparation and profit.

More and more men came into view as they trudged up to the ramparts, some of them simply lounging at ease, a group round a fire apparently cooking bacon, others throwing spears at a mark. They looked very much like Englishmen in their grubby woolens, Shef decided. But there was a difference. Every group of men Shef had ever seen before had had in it its proportion of casualties, men not fit to stand in the line of battle: men whose legs had broken and had been set awry; men undersized, deformed; men with bleared eyes from the marsh fever or with old head injuries that affected the way they talked. There were none like that here. Not all were of great stature, Shef was rather surprised to see, but all looked competent, hard-bitten, ready. Some adolescents, but no boys. Bald men and grizzled men, but no palsied elders.