On July 10, 1917, a decoy ship, H.M.S. _Glen_, a small schooner with auxiliary power and armed with one 12-pounder and one 6-pounder gun, commanded by Sub-Lieutenant K. Morris, R.N.R., was in a position about forty miles south-west of Weymouth when a submarine was sighted on the surface some three miles away. She closed to within two miles and opened fire on the _Glen_. The usual practice of abandoning ship was followed, the submarine closing during this operation to within half a mile and remaining at that distance examining the _Glen_ for some time. After about half an hour she went ahead and submerged, and then passed round the ship at about 200 yards distance, examining her through the periscope, finally coming to the surface about 50 yards off on the port quarter. Almost immediately she again started to submerge, and fire was at once opened. The submarine was hit three or four times before she turned over on her side and disappeared. There was every reason to believe that she had sunk, although no one was on deck when she disappeared. No survivors were rescued. The feature of this action was again the restraint shown by the commanding officer of the _Glen_ and the excellent discipline of the crew. On August 8, 1917, the decoy ship H.M.S. _Dunraven_, in Lat. 48.0 N., Long. 7.37 W., armed with one 4-inch and four 12-pounder guns and two torpedo tubes, commanded by Captain Gordon Campbell, V.C., R.N., sighted a submarine on the surface some distance off. The submarine steered towards the ship and submerged, and soon afterwards came to the surface some two miles off and opened fire. The _Dunraven_, in her character of a merchant ship, replied with an after gun, firing intentionally short, made a smoke screen, and reduced speed slightly to allow the submarine to close.