This final volume of the history of the Merchant Navy takes us from the onset of unrestricted submarine warfare to the conclusion of hostilities, and its prime concern is to give an account of the ordeal to which the seamen were subjected in the last twenty months of the war. But it also gives a good account of how the Merchant Navy took the war to the enemy through the 10th Cruiser Squadron and the Auxiliary Patrol, and in surface engagements involving British armed merchant cruisers. The losses to British merchant shipping make grim reading. For the five months from February 1917 (the start...