"U-66" broke off her pursuit after two hours, having endured multiple attacks from "Falmouth"s screening destroyers. One depth charge attack blew out all the lights on "U-66" and knocked clips off two hatches that caused the boat to flood with a considerable quantity of water before the leaks could be sealed. "Falmouth" continued under tow at until she crossed "Standlinie II" and was attacked and sunk by "U-63" around noon the next day. Records on "U-66" next appear in late 1916, when she is reported as one of the U-boat escorts assisting the German merchant raider into the North Atlantic. "Wolf", under the command of Karl August Nerger, began a 15-month raiding voyage on 30 November that took the ship into the Indian and Pacific Oceans before a safe return to Germany. "U-66"s specific locations for this duty are not reported, but on 11 December she sank a Norwegian steamer and a Swedish sailing ship. "U-66" shelled the 1,090-ton Norwegian steamer "Bjor" southwest of the Norwegian island of Ryvingen. The ship and her general cargo, headed from Göteborg to Hull, were sent to the bottom without loss of life, and her crew was safely landed by 14 December. The same day, "U-66" also sank the 311-ton Swedish sailing ship "Palander" off the island of Oxö, near the town of Tornio on the Sweden–Finland border. From the early stages of the war the Royal Navy had blockaded Germany, preventing neutral shipping from reaching German ports. By the time of the so-called "turnip winter" of 1916–17, the blockade had severely limited imports of food and fuel into Germany. Among the results were an increase in infant mortality and as many as 700,000 deaths attributed to starvation or hypothermia during the war. With the blockade having such dire consequences, Kaiser Wilhelm II personally approved a to begin on 1 February 1917 to help force the British to make peace. The new rules of engagement specified that no ship was to be left afloat. In late March, "U-66" sank another two vessels. The 3,597-ton cargo ship "Stuart Prince" was headed from Manchester and Belfast to Alexandria with a general cargo when "U-66" came upon her off Broad Haven, County Mayo. "U-66"s torpedo attack was successful, sinking the ship and killing 20 men, including the ship's master.