only 136,100 375,000 511,100 It will be noticed that by the last quarter of 1918 the output of shipping in the United Kingdom alone had overtaken the losses of British shipping.
It is not possible to give exact information as to the particular means by which the various German submarines were disposed of, but it is believed that of the 186 vessels mentioned as having been lost by the Germans at least thirty-five fell victims to the depth charge, large orders for which had been placed by the Admiralty in 1917, and it is probably safe to credit mines, of which there was a large and rapidly increasing output throughout 1917, with the same number--thirty-five--a small proportion of these losses being due to the mines in the North Sea Barrage.

Our own submarines accounted for some nineteen.
Our destroyers and patrol craft of all natures sank at least twenty by means of gunfire or the ram, and some four or five more by the use of towed sweeps of various natures.

Our decoy ships sank about twelve; four German submarines are known to have been sunk by being rammed by men-of-war other than destroyers, four by merchant ships, and about ten by means of our nets.

It is fairly certain that at least seven were accounted for by aerial attack.

Six were interned, some as the result of injury after action with our vessels.
The total thus accounted for is 156.