The border was formed by a small river, but because a long wall, six feet high and lined with sandbags to protect Thai sharpshooters, ran alongside it, it was invisible. There was only one breach in the wall, at the point where a bridge spanned the river. Vietnamese forces lay in wait on the other side, but they, too, were invisible, their positions perfectly camouflaged. It was clear, however, that the moment anyone set foot on the bridge, the invisible Vietnamese would open fire.

The parade participants went up to the wall and stood on tiptoe. Franz peered into the gap between two sandbags, trying to see what was going on. He saw nothing. Then he was shoved away by a photographer, who felt that he had more right to the space.

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