On the morning of September 6th three subchaser units, under the command of Ensign Ashley D. Adams, U.S.N.R.F., were listening at a point about 150 miles west of Land's End. At about eleven-thirty two of these units detected what was unquestionably the sound of a submarine. Moreover, the usual "fixes" disclosed that the enemy was close at hand; so close that two of the units ran up and dropped their charges. This first attack produced no result on the submarine; the depth charge from one of the howitzers, however, unfortunately landed near one of the chasers, and, though it injured no one, it put that particular unit out of commission. However, for two hours Ensign Adams's division kept closely on the heels of the quarry, now stopping to obtain a "fix," now running full speed to catch up with the fleeing prey. At one o'clock the plotting-room reported that the submerged boat was just about a hundred yards ahead. The three chasers laid barrages according to pattern, and the three "Y" guns shot their depth charges; the region of the "fix" was so generously sowed with these bombs that it seemed an impossibility that the German could have escaped. As soon as the tumult quieted down, the chasers put out their tubes and listened. For twenty minutes not a sound issued from the scene of all this activity. Then a propeller was heard faintly turning or attempting to turn. The noise this time was not the kind which indicated an effort to steal away furtively; it conveyed rather the impression of difficulty and strain. There was a slight grating and squeaking such as might have been made by damaged machinery. This noise lasted for a few seconds and then ceased. Presently it started up again and then once more it stopped. The submarine was making a little progress, but fitfully; she would go a few yards and then pause. A slight wake now appeared upon the surface, such as a submerged U-boat usually left when the water was calm; the listeners at the tube were pleased to note that the location of this disturbance coincided precisely with their "fix," and thus, in a way, confirmed their calculations. One of the subchasers promptly ran ahead and began to drop depth charges on this wake. There was not the slightest doubt that the surface boat was now directly on top of the submarine. After one of the depth charges was dropped, a black cylindrical object, about thirty inches long, suddenly rose from the depths and jumped sixty feet into the air; just what this unexpected visitant was no one seems to know, but that it came from the hunted submarine was clear.