Germany’s U-boats have had another good month, sinking some 670,000 tons of merchant shipping (a total including both Allied ships and neutral ships trading with the Allies). This is a good bit less than was achieved in April but is still very impressive.
Holtzendorff, the German navy’s chief of staff, has calculated that monthly shipping losses of 600,000 tons will force Britain out of the war. If his calculations are correct and these losses can be maintained then autumn should see Britain starved out of the war. With Russia in chaos and Italy not up to much that would effectively leave France to face the might of Germany alone.
A U-boat puts to sea, garlanded with flowers (WW2 Weapons: Diary February 1, 1917)