Scapa Flow, flω', a sheltered body of water in Scotland's Orkney Islands. This stretch of sea, about 15 miles (24 km) long and 8 miles (13 km) wide, was a major British naval base in World Wars I and II. After the armistice in 1918 a large part of the German fleet, consisting of 77 surface vessels and 102 submarines, was interned at Scapa Flow by the victorious Allies. In June, 1919, caretaker German crews sank the vessels to prevent them from being divided among the Allied nations. In World War II, a German submarine penetrated British defenses at Scapa Flow in 1939 and sank the battleship Royal Oak.
World War I was the great armed conflict of 191418. Until World War II, it was often called the Great War because it was the most destructive and widespread war the world had ever seen.
World War I, also known as the Great War, left Germany and other countries humiliated and angry. Germany viewed the armistice that ended World War I as a truce, rather than a surrender. This view was ignored. Learn about events that led to World War II.