MOVE IT HERE! I called to Jean Dueux, on his perch atop a tree. A little to the right. Where the road narrows.

High above the road, Jean hoisted a heavy wheat sack bulging with rocks and gravel. He tied off the sack with a long rope and double knotted the other end to a sturdy branch.

I'll send the horse, I said to him. When it reaches my position, let the rocks go.

Since the bailiff's visit, we had begun the task of fitting the town for its defenses. Woodsmen sheared off wooden barriers to be placed in rows along the town's western edge. Stakes were sharpened and driven into the ground at jutting angles that even the bravest warhorse would not advance upon. Large stones were half buried in the road.

And we began to make weapons. A few old-timers brought out their swords, rusty things. Odo polished and sharpened them on his lathe. The rest of our arsenal consisted of clubs and mallets, a few spears and billhooks, iron tools. From these we made arrows that could pierce armor. We were a town of Davids preparing for Goliath.

I backed off and signaled down the road. Apples, the baker's son, slapped the horse and sent him coming. Jean braced himself on his perch, tipping the weighted sack to the edge. When the horse passed my spot, I shouted, Release!

Jean let it go. In a sweeping arc, it hurtled out of the sky like a boulder, picking up speed. As the horse passed, it swung across the road with a loud whoosh, at exactly the height of a man atop his mount. It might as well have been hurled by a catapult. Even the staunchest rider would not withstand its ............