"World War I was shaped by the new vehicles developed during the four years of conflict. A century after the start of the war, we're looking back at the most remarkable vehicles—the planes, cars, tanks, ships, and zeppelins—it helped bring about.
For British merchant vessels operating during World War I, few things were so terrifying as the submarine. The German navy used the Unterseeboot, or U-boat, to sink 5,000 ships measuring more than 13 million gross register tons during the war.
As the war geared up, the Germans and the British believed the big battles would be fought with huge ships like the HMS Dreadnought and its sisters. Submarines, they figured, would be limited to coastal defense, preventing blockades by enemy ships and serving as lookouts…"
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