During the Second World War much of the south coast of England was fortified with pillboxes, tank obstacles and machine gun posts in anticipation of a Nazi invasion, the plan for which was known to the Nazis as Operation Sealion. These objects can be seen closer to the sea and require a diversion. The closest is Newhaven Fort, a 5-mile diversion from the path, which is an attraction that houses many World War II artefacts and documents with examples of the huge cannons used in coastal defence.