Grand Harbour was the base for the Knights of St John for 268 years, and after their departure became a strategic base for the British for a further 170 years. It was the site in the late 16th century of a devastating tornado that killed 600 people and destroyed a shipping armada. The area was the scene of much of the fighting in the First Siege of Malta when the Turks attempted to eject the Knights of St John. The whole area was savagely bombed during the Second Siege of Malta during World War II, as the docks and military installations around the port were legitimate targets for Axis bombers. However collateral damage wrecked much of Valletta and The Three Cities, and caused large numbers of civilian casualties. The harbours and docks are still active but with the departure of the British Military the harbour lost much of its military significance. A considerable part of Malta's commercial shipping is now handled by the new free port at Kalafrana, so the harbour is much quieter than it was in the first half of the 20th century.