  (CONTAINED IN THE POCKET AT THE END OF THE BOOK) A. Approach Areas and Typical Routes. B. Typical Approach Lines. C. Barred Zones Proclaimed by the Germans. D. Patrol Areas, British Isles. E. Patrol and Minesweeping Zones in the Mediterranean. F. Showing French and British Ports within Range of the German Bases at Ostend and Zeebrugge. To The Officers and Men of our Convoy, Escort, Patrol and Minesweeping Vessels and their Comrades of the Mercantile Marine by whose splendid gallantry, heroic self-sacrifice, and unflinching endurance the submarine danger was defeated |
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