In February 1917, German U-boats launched a savage unrestricted campaign against both Allied and neutral shipping. At its peak in April, 860,000 tons of Allied merchant shipping was sunk. Britain's supremacy at sea was being severely challenged and with it the chances of victory in the wider war. Taking up the challenge was Britain's new First Sea Lord, Sir John Jellicoe, until the previous December C-in-C of the Britain's Grand Fleet - famously described...
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