It was a clear November afternoon, and the destroyer _Fanning_ was following her appointed route through the waters of the North Sea. Off to starboard the destroyer _Nicholson_ was plunging on her way, throwing clouds of black smoke across the horizon. Near by was a merchant vessel, and the destroyers were engaged in taking her through the dangerous waters to safety. The air was so clear that minutest objects on the horizon were easily picked up by the questing binoculars of the men on watch. Suddenly came a cry from one of the forward lookouts: "Periscope, two points off the starboard bow!" The call sounded from stem to stern, and instantly the alarm to general quarters was sounded while the helm was thrown hard over. The signalman bent over his flag-locker and, in compliance with the order of the commander, bent flags onto the halyards, giving the location of the submarine to the _Nicholson_, while heliograph flashes from the bridge summoned her to joint attack. The waters were smooth, with a long swell, and the lookout had seen a scant eighteen inches of periscope, which had vanished immediately it fell under his vision. Undoubtedly the observer at the other end of the submarine's periscope had seen the _Fanning_ at about the same time the presence of the undersea craft was detected. It had appeared about 400 yards from the destroyer's course. In less time than it takes to tell, the _Fanning_, with throttles suddenly opened, plunged into the waters where the periscope had last been seen. And at the proper moment the commander, standing tensely on the bridge, released a depth-bomb from its fixed place. The explosive, 300 pounds in weight, sank with a gentle splash into the rolling wake of the destroyer and, at the depth as regulated before the bomb was released, it exploded with a terrific report. Up from the ocean rose a towering column of water. It hung in the air for a moment like a geyser, and then gradually fell back to the level of the sea. A score of voices proclaimed the appearance of oil floating upon the water. Oil is sometimes released by a submarine to throw an attacking destroyer off the scent; but this time there were bubbles, too. That was quite significant. Then while the _Fanning_ circled the spot wherein the explosion had occurred, the _Nicholson_ stormed up, cut across the supposed lurking-place of the submarine, and released one of her depth charges. She, too, circled about the mass of boiling, oil-laden water. For several minutes the two destroyers wheeled in and out like hawks awaiting their prey, and then suddenly there was a cry as a disturbance was noted almost directly between the two craft. The rush of water grew in volume until, as the men of the destroyers watched with all the ardor of fishermen landing trout, the U-boat came to the surface like a dead whale.