Two years in the North Sea in the trawler _Zealous_ gave him plenty of experience and adventure, until the trawler came to an untimely end in an encounter with some German torpedo-boats, but not before she had sent one of them to the bottom. The outcome of this little "scrap", as far as Tom Webb was concerned, was that the ex-Tenderfoot was given a commission as Acting Sub-lieutenant, R.N.R., and appointed to the armed merchant-cruiser _Portchester Castle_. It required a fair effort on Webb's part to carry out one portion of the Scout's creed and "keep smiling" as he mounted the bridge in this particular middle watch. Turning out of a comfortable bunk to do duty in an exposed, spray-swept post was not a matter of choice but of obligation. Still dazed by the sudden transition from the electric light 'tween decks to the intense blackness of the night, Webb could just discern the figure of the Sub he was about to relieve. "Mornin', Haynes!" "Wish you well of it, my festive," was Dick Haynes's rejoinder. "Nothing to report. Here's the course. You ought to sight the Spanish coast in an hour or so. Well, so long, and good luck!" The relieved Sub-lieutenant vanished down the bridge-ladder. Webb, muffled in his greatcoat, satisfied himself that the quartermasters were acquainted with the correct compass course, and received the usual report: "Screened light's burning, sir, and all's well." This done he took up his position on the lee side of the bridge and, sheltered by the storm-dodger, gazed fixedly in the direction of the swelter of black water ahead of the labouring ship. Slowly the minutes sped. The _Portchester Castle_, steaming at seventeen knots, rolled and plunged through the long waves without so much as the distant navigation lights of another vessel to break the monotony of the night. Yet the utmost vigilance was necessary. The safety of the ship depended upon the sharp eyes of the two look-out men on the fo'c'sle, and the alertness of the junior watch-keeper on the bridge. To the ordinary risk of collision was added another danger, for hostile submarines had been reported making for the Mediterranean, and were reasonably expected to take a very similar course to that followed by the British armed merchant-cruiser. The "Rules of the Road for Preventing Collision at Sea" reduced the former danger to a minimum, provided an efficient watch were maintained; against the mad dogs of the sea--the German submarines, who never hesitated to torpedo at sight anything afloat regardless of her nationality--the ship had to take her chances, and trust to Providence and a quick use of the helm to avoid the deadly torpedo, should the phosphorescent swell in the wake of the weapon betray its approach.