"Sub-chasers _47_, _48_, and _208_, while on running patrol, made contact with submarine at 14.30. After four runs of various courses and distances, made position fix at 15.30, course 25 mag., distance 400 yards. Made attack in line formation _47_ dropping six charges, _208_ dropping five, and _48_ dropping one charge. Stopped and listened; submarine heard by all three boats sounding badly damaged and within 200 yards of _48_. As the other two chasers were not in position to make an attack together without losing time, _48_ attacked, dropping two depth-charges. Stopped and listened. Submarine heard by all boats, {274} sounded as if having trouble with her engines, and was hammering. Positive fix directly ahead of _47_ who instantly attacked with two depth-charges. Stopped and listened. Submarine heard by _47_ in direction of _208_. _208_ heard, but could not centre sound. A few seconds later, _208_ and _47_ got a fix just astern of the _208_, which attacked as fast as she could turn and get under way, dropping two stern depth-charges. The first charge of this attack did not explode, although charge was properly set. The _208_ reported an oil slick where last charge exploded. On investigation this was found to be merely disturbances caused by the explosion of the depth-charge. While the _208_ was investigating this disturbance, several members of her crew saw what appeared to be the wake of a submarine on her port beam, but did not bring it to the attention of the commanding officer in time to make an attack. Stopped and listened. Positive fix by all three chasers within 200 yards of the _208_, which immediately attacked with two stern charges and Y gun. First stern charge failed to explode. Chasers re-formed in original chase formation and got fix distance 400 yards. As _208_ had only one charge left, she remained behind in case submarine should come to the surface. _47_ and _48_ attacked, each dropping two depth-charges. First charge dropped by _48_ failed to explode. Stopped and listened. No definite fixes were obtained, but all chasers heard submarine running with apparent difficulty at about 310°. Ran a thousand yards and listened. Sound of submarine lost at 1,800. From then on disturbance due to wireless communication {275} and the arrival of two destroyers, one trawler, two motor-launches, and the passing of a convoy, made it impossible to again pick up submarine." Such was an encounter, typical of many, and all invaluable as police-work, even though they failed, as did this one, in sinking or capturing the prey.