(...) One morning they forded a river at a wide shallow place full of the noise of stones and foam. The far bank was steep and slippery. When they got to the top of it, leading their ponies, they saw that the great mountains had marched down very near to them.
J.R.R. Tolkien The Hobbit
The Road was still running steadily downhill, and there was now in places much grass at either side, in which the hobbits walked when they could, to ease their tired feet. In the late afternoon they came to a place where the Road went suddenly under the dark shadow of tall pine-trees, and then plunged into a deep cutting with steep moist walls of red stone. Echoes ran along as they hurried forward; and there seemed to be a sound of many footfalls following their own. All at once, as if through a gate of light, the Road ran out again from the end of the tunnel into the open. There at the bottom of a sharp incline they saw before them a long flat mile, and beyond that the Ford of Rivendell. On the further side was a steep brown bank, threaded by a winding path; and behind that the tall mountains climbed, shoulder above shoulder, and peak beyond peak, into the fading sky.
`You look splendid,' he said aloud. `I will risk a brief tale without consulting Elrond. But quite brief, mind you, and then you must sleep again. This is what happened, as far as I can gather. (...) `When the Ringwraiths swept by, your friends ran up behind. Close to the Ford there is a small hollow beside the road masked by a few stunted trees. There they hastily kindled fire; for Glorfindel knew that a flood would come down, if the Riders tried to cross, and then he would have
to deal with any that were left on his side of the river. The moment the flood appeared, he rushed out, followed by Aragorn and the. others with flaming brands. Caught between fire and water, and seeing an Elf-lord revealed in his wrath, they were dismayed, and their horses were stricken with madness. Three were carried away by the first assault of the flood; the others were now hurled into the water by their horses and overwhelmed.'
J.R.R. Tolkien Lord of the Rings - The Fellowship of the Ring
And by daylight, you can see that the Devs have made their homework: