大西洋の壁
The Channel Islands were amongst the most heavily fortified parts of the Atlantic Wall, particularly Alderney which is the closest to France. On 20 October 1941 Hitler signed a directive, against the advice of Commander-in-Chief von Witzleben, to turn the Channel Islands into an "impregnable fortress". In the course of 1942, one twelfth of the resources funnelled into the whole Atlantic Wall was dedicated to the fortification of the Channel Islands. Hitler had decreed that 10% of the steel and concrete used in the Atlantic Wall go to the Channel Islands. It is often said the Channel Islands were better defended than the Normandy beaches, given the large number of tunnels and bunkers around the islands. By 1944 in tunnelling alone, of rock had been extracted collectively from Guernsey, Jersey, and Alderney (the majority from Jersey). At the same point in 1944 the entire Atlantic Wall from Norway to the Franco-Spanish border, excluding the Channel Islands, had extracted some .