On March 1st, 1917, "C 19" (Lieutenant A. C. Bennett) was steering east from the Hinder Light, when she sighted (by moonlight) a small submarine right ahead steering straight at her. "C 19" decided that this looked like another British C boat, several of which were in the vicinity. Each boat turned to north and flashed a challenge. The German then made I.M.I. (the Morse signal to "repeat," common knowledge to all nations). The boats were then beam to beam at 100 yards' range, and the German hailed in his own language. "C 19" had no gun, and was trying to swing round to bring the bow tubes to bear, having no doubt as to what to do in the matter. The enemy continued to make I.M.I., and turned away to get out of the line of fire. This made it a stern-chase with "C 19" close up and gaining; the German then fired a starshell, and "C 19" replied with rifles and automatic pistols. That was too much for the Hun; he kicked his tail up and dived, with the bullets smacking on his conning-tower as he went, and "C 19's" starboard torpedo--fired as he dived--racing over the top of him. The U-boat's periscope showed once on the bow, and "C 19" turned to ram and passed over it, without, unfortunately, hitting anything solid. "C 19," on the 5th March, met another Flanders Flotilla boat, this time with a heavy sea running, which prevented torpedoes being fired with any hope of accuracy. The C boat charged at once, using rifles and pistols as she came in. The enemy dived, and "C 19" passed over her, the bump being slightly felt below. It is possible that the German's periscope was damaged, but he saved his skin by getting under in time. On the 14th May 1917, in thick weather, "C 6" (Lieutenant Brookes) was feeling for the Hinder Light-vessel. She found it at 7.30 A.M. close aboard, and at the same time a German submarine found it, and, appearing 300 yards away, dived at once. "C 6" went under also and pursued by the use of hydrophones. In about half an hour the enemy's motors were heard to slow up and stop, and "C 6," thinking he had gone to the bottom to avoid the chase, came to the surface to get the mast down, as it had been left standing in the hurry of getting under. The visibility was only 200 yards, and there was nothing in sight. "C 6" dived again, and, as she did so, heard the rattle and hum of propellers as a torpedo missed her over the top. The German had evidently come up for a look instead of taking bottom. The exasperated "C 6" pursued by hydrophone for another quarter of an hour, but the sound of the enemy's motors was then lost.