WHEN NEXT THEY SAW C OLONEL Barnes, they were well down the last reach of the Hope. The tide was rushing away from them so ardently that it threatened to ground Atalanta on the floor of an empty Thames. The river drew narrower every minute as its contents fled to the sea, exposing vast gray-brown slatherings to the air. Southend could be seen a few miles off the port bow, stranded in a mud desert. But what dominated the prospect was the sweep of the open ocean, which now subtended a full quarter of the horizon.