The wind was blowing strongly. Snowflakes were being whisked hither and thither, like spray from a wave. Had it not been for the gleam from the snow-covered ground, it would have been impossible to see ten paces, here. As it was, it was intensely dark.

"It's lucky that it's downhill, Percy, or we should never find our way to the water's edge. If we keep descending, we must be there, at last."

Before starting, the boys went a few paces from each other; and were pleased to find that their white costumes suited admirably as, between the driving snow and the white sheet upon the ground, they could not make each other out at more than eight or ten yards, even when they knew exactly where they stood. They now began to descend the hill, very carefully, step by step. The snow upon the ground made walking much more easy than it otherwise would have been. Their footsteps--muffled alike by the India-rubber soles, and the snow upon which they walked--were inaudible, even to themselves. They had several walls to climb, and the noiseless India-rubber soles were of good service, here. Several times they could hear the sentries, beating their feet upon the ground to warm them; but in no case were they near enough to see them.

At last, after an hour and a half--spent in passing the three hundred yards which separated them from the river--they reached, in safety, the wall of the road which runs along by the river. Here the sentries were pacing along at distances of thirty or forty yards apart. The white houses, upon the opposite side of the road, could be faintly seen; and the boys moved along until opposite an opening between them, by which they could get through to the river. Looking over the wall, they could watch the sentries and--choosing their time when one had just passed, so that his back would be turned towards them--he no sooner disappeared in the darkness than they dropped noiselessly into the road, ran across the street, climbed a low railing, and stood in a garden which reached down to the river.

They stood watching, for some time, to assure themselves that no sentry was placed in the garden; but at last they stole forwards and stood at the end of the garden, with the river at their feet. The snow--which was at their backs--was falling faster than ever. The river deepened rapidly from the wall; but the water was low enough for anyone to get along on the sloping side--faced with rough stone--between the foot of the wall and the water.

The boys got over the wall, took the dummy from the bag and, holding one end of the cord, put it quietly into the water; and allowed it to float down, about sixty yards.

"Now, Percy," Ralph said, "you get ready to slip into the water, as quietly as possible, the moment you hear a splash. I will leave this bag here, so as to know exactly where you have gone in and--as the rope is plenty long enough--you keep hold of it here, at sixty yards from the dummy; and I will fasten the slack end to the stone so that, when I go in, I have only to hold the rope in my hand, to be able to join you. I will take this heavy coping stone in my hand; will crawl along on this shelving bank, till I arrive at the dummy; and will then throw the stone in, and run back at full speed, and be in the water a few seconds after you are."

"All right, Ralph, I understand. Keep your pistol cocked in your hand, as you go."

Ralph crept quietly along, under the wall, until he saw the dummy floating at the edge of the water, a few feet below him. He rose on his feet, to throw in the stone; when he heard a deep exclamation behind him and, looking round, he saw a dark figure within two feet of him. Another moment, and the sentry would have brought his rifle to his shoulder-- for he sprang back, giving a loud shout--but Ralph wheeled round instantaneously, threw up his revolver, and fired at the sentinel's body.

He saw him fall; turned round, hurled the heavy stone with a loud splash into the water, and then--crawling low under the wall--ran at full speed back again. As he did so, two sentries in the garden over his head fired, in the direction of the splash in the water; and shouts were heard all along the bank.