The attached New York Times article contains information released from the British Admiralty early in 1915 regarding the number of British merchant and fishing vessels lost to German U-boat attacks during the first seven months of the war. The article names eight non-military ships sunk during the month of March, 1915. Additionally, the Admiralty also stated the total number of British shipping lost through German naval attacks from the start of the war through March tenth of that year:
"...eighty-eight merchant vessels were sunk or captured. Of these fifty-four were victims of hostile cruisers, twelve were destroyed by mines, and twenty-two by submarines. Their gross tonnage totaled 309,945."
Click here to read about the new rules for warfare that were written as a result of the First World War - none of them pertain to the use of submarines.