HMS Zealous was a Z-class destroyer of the Royal Navy built in 1944 by Cammell Laird. She served during the Second World War, participating in operations in the North Sea and off the Norwegian coast, before taking part in some of the Arctic convoys. She spent a further ten years in Royal Navy service after the end of the war, before being sold to the Israeli Navy, which operated her as INS Eilat. She saw action during the Suez Crisis in 1956, attacking Egyptian ships and was still active by the outbreak of the Six-Day War in 1967. She was sunk several months after the conflict by missiles launched from several small Egyptian missile boats; this made her the first vessel to be sunk by a missile boat in wartime. It was an important milestone in naval surface warfare, which aroused considerable interest around the world in the development of small manoeuvrable missile boats.