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When I resumed my place in the conning-tower I saw in the periscope (for we had dived) that a lightship was within a few hundred yards of us upon the port bow. Two men were sitting on her bulwarks, but neither of them cast an eye upon the little rod that clove the water so close to them. It was an ideal day for submarine action, with enough ripple upon the surface to make us difficult to detect, and yet smooth enough to give me a clear view. Each of my three periscopes had an angle of sixty degrees so that between them I commanded a complete semi-circle of the horizon. Two British cruisers were steaming north from the Thames within half a mile of me. I could easily have cut them off and attacked them had I allowed myself to be diverted from my great plan. Farther south a destroyer was passing westwards to Sheerness. A dozen small steamers were moving about. None of these were worthy of my notice. Great countries are not provisioned by small steamers. I kept the engines running at the lowest pace which would hold our position under water, and, moving slowly across the estuary, I waited for what must assuredly come.

I had not long to wait. Shortly after one o’clock I perceived in the periscope a cloud of smoke to the south. Half an hour later a large steamer raised her hull, making for the mouth of the Thames. I ordered Vornal to stand by the starboard torpedo-tube, having the other also loaded in case of a miss. Then I advanced slowly, for though the steamer was going very swiftly we could easily cut her off. Presently I laid the Iota in a position near which she must pass, and would very gladly have lain to, but could not for fear of rising to the surface. I therefore steered out in the direction from which she was coming. She was a very large ship, fifteen thousand tons at the least, painted black above and red below, with two cream-coloured funnels. She lay so low in the water that it was clear she had a full cargo. At her bows were a cluster of men, some of them looking, I dare say, for the first time at the mother country. How little could they have guessed the welcome that was awaiting them!

On she came with the great plumes of smoke floating from her funnels, and two white waves foaming from her cut-water. She was within a quarter of a mile. My moment had arrived. I signalled full speed ahead and steered straight for her course. My timing was exact. At a hundred yards I gave the signal, and heard the clank and swish of the discharge. At the same instant I put the helm hard down and flew off at an angle. There was a terrific lurch, which came from the distant explosion. For a moment we were almost upon our side. Then, after staggering and trembling, the Iota came on an even keel. I stopped the engines, brought her to the surface, and opened the conning-tower, while all my excited crew came crowding to the hatch to know what had happened.

The ship lay within two hundred yards of us, and it was easy to see that she had her death-blow. She was already settling down by the stern. There was a sound of shouting and people were running wildly about her decks. Her name was visible, the Adela, of London, bound, as we afterwards learned, from New Zealand with frozen mutton. Strange as it may seem to you, the notion of a submarine had never even now occurred to her people, and all were convinced that they had struck a floating mine. The starboard quarter had been blown in by the explosion, and the ship was sinking rapidly. Their discipline was admirable. We saw boat after boat slip down crowded with people as swiftly and quietly as if it were part of their daily drill. And suddenly, as one of the boats lay off waiting for the others, they caught a glimpse for the first time of my conning-tower so close to them. I saw them shouting and pointing, while the men in the other boats got up to have a better look at us. For my part, I cared nothing, for I took it for granted that they already knew that a submarine had destroyed them. One of them clambered back into the sinking ship. I was sure that he was about to send a wireless message as to our presence. It mattered nothing, since, in any case, it must be known; otherwise I could easily have brought him down with a rifle. As it was, I waved my hand to them, and they waved back to me. War is too big a thing to leave room for personal ill-feeling, but it must be remorseless all the same.