The Moon of Gomrath

Colin and Susan turned. The flames were a scarlet curtain between hill and sky, and within them, and a part of them, were three men. Even while the children looked, they became more solid, rounded, and independent of the flames through which they stared. Then they were real and terrible...Red were they all, weapons and clothing and hair, both horses and men. The three horsemen rode slowly out of the fire. 'Run,' said Colin to Susan. But they were not half-way to the trees before there was a drumming of hoofs, a flutter of cloaks, and Colin and Susan were hooked off their feet and thrown across the necks of horses that hurled themselves through the night as though world's ruin were at their heels.