After the fall of France in 1940, Germany was on Britain doorstep. In danger of invasion Britain started to build up defences to repel the German invaders. Focus was first given to miles of coastline that were venerable, as the Germans were only 20 miles from British soil. Along the coastline Anti-tank stop-lines were built in an attempt to prevent the German Panzers from landing on the coast. Machine gun emplacements were put up along the coastline to try and prevent and stop enemy infantry securing a beachhead that could make it safe for reinforcements to land. To help prevent this barbwire and minefields were placed in areas that were prime targets for landings.