The day was a pleasant one, the sun was shining clear and a fresh salty breeze was blowing down the estuary. The officers, however, shook their heads, talked of "low visibility," and pointed out that an invisible mist hung over the water, whose cumulative effect was not at all to their liking. First there went out a new variety of submarine, steam submarines of extraordinary size and speed; there followed a swift procession of destroyers and lighter cruisers, many signalling with blinker and flag. The outgoing of the destroyers was a sight not to be forgotten, for more than anything else did it impress upon me the titanic character of the fleet. _Destroyers passed one every fifty seconds for a space of many hours_. You would hear a hiss, and a lean, low rapier of a vessel would pass within a hundred yards of the flagship and hurry on, rolling, into the waiting haze of the open sea, and as you watched this first vessel leave your bow astern, you would hear another watery hiss prophetic of the following boat. On our own vessel all boats had long before been hoisted to their places; there were mysterious crashing noises, bugle calls, a deal of orderly action. Time passed; a long time full of movement and stir. The greater vessels began to go out, titans of heroic name, _The Iron Duke_, _Queen Elizabeth_, _Lion_. A broad swirling road of water lay behind them as one by one they melted into that ever mysterious obscurity ahead. Then with a jar, and a torrent of crashing iron thunder dreadful as a disintegration of the universe itself, our own immense anchor chains rose from the water below, and the American flagship got under way. We looked with a meditative eye on the bare shores of the firth wondering what adventures we were to have before we saw them again. Behind us the mist gathered, ahead, it melted away. And thus we stood out to the open sea. Night came, starlit and cold. Just at sun-down one of the British ships destroyed a floating mine with gun fire. I sought information from an officer friend. "What about the mine problem?" "Never bothers us a bit, though the Germans have planted mines everywhere. This North Sea is as full of them as a pudding is of plums." "Why is it then that the fleet doesn't lose ships when out on these expeditions?" "Because the British mine sweepers have done so bully a job." "But once you get beyond the swept channels at the harbour mouths, what then?" "The mine-sweepers attend to the whole North Sea." "You mean to say that the Admiralty actually clears an ocean of mines?" "To all intents and purposes, yes. Haven't you read of naval skirmishes in the North Sea? They are always having them. Many of those skirmishes take place between patrol boats of ours and enemy patrols. Of course it's a task, but the British have done it. One of the most wonderful achievements of the war." "Suppose the Germans try to reach the British coast?"