The position was about 25´ south of Beachy Head. "C 15" was on patrol in rather misty weather, and at the time of sighting the enemy both boats were on the surface, U-C 65 steering home up Channel, "C 15" steering N. by E. across her bows. Both boats saw each other at the same time, and the German watched the English boat go under to attack. The obvious reply was to either dive also or to alter course and pass round the "danger-radius" of the torpedoes on the surface. The German Captain had two mental handicaps--over-confidence and (having just finished a long trip) over-anxiety to get home on leave. He decided not to alter course or delay his passage, but explained to his First Lieutenant that it was quite easy to dodge a torpedo if a good look-out was kept and the helm moved quickly. The First Lieutenant appears to have had philosophic doubts as to the wisdom of the proceeding, his doubting being justified when, on seeing the firing-splash as "C 15" fired, the Captain neatly dodged one torpedo and received the other fairly amidships. Lieutenant Dolphin had fired two--"spread" slightly for deflection; not having "declared to win" with either, the question of which one hit did not trouble him. U-C 65 probably won a moral victory, but--"C 15" sank her.
The C boats working round the N. Hinder Light-vessel were liable to make sudden "contacts" with the enemy, usually in thick weather or at night. Both sides would be trying to make the lightship to fix their positions, and on occasions two belligerent submarines would make the lightship together.
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.