Further charges were dropped, and an obstruction on the bottom was located by means of a sweep.

This engagement held peculiar interest for me, since during my visit to Canada in the winter of 1919 the honour fell to me of presenting to a Canadian--Lieutenant G.L.
Cassady, R.N.V.R .-- at Vancouver the Distinguished Service Cross awarded him by His Majesty for his work in Motor Launch No.

135 on this occasion.
_Motor Launches_ were organized into submarine hunting flotillas during the year 1917.

These vessels were equipped with the directional hydrophone as soon as its utility was established, and were supplied with depth charges.

In the summer of 1917 four such hunting flotillas were busy in the Channel; the work of one of these I have described already, and they certainly contributed towards making the Channel an uneasy place for submarine operations.
These results were, of course, greatly improved on in 1918, as the numbers of ships fitted with the "fish" and other hydrophones increased and further experience was gained.
The progress in supply of hydrophones is shown by the following table: Supply of Directional Date General Service Mark I and Shark Fin Fish 1917.