Source:
Grove, Eric J. The Defeat of the Enemy Attack on Shipping
1939-1945, Table 4.
Navy Records Society, volume 137 (Ashgate Publications), 1997.
Despite the title, this book contains some valuable information
on the WW1 submarine campaign, and is well worth consulting.
| July 1917 | Nov 1917 | April 1918 | Sept 1918 | |
|---|---|---|---|---|
| Destroyers | 64 | 102 | 115 | 116 |
| Sloops | 11 | 24 | 35 | 16 |
| Patrol Boats | 16 | 44 | 45 | 18 |
| TOTAL: | 91 | 170 | 195 | 150 |
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