Occupied France in the context of "Case Anton"

The Government of Vichy France was the collaborationist ruling regime or government in Nazi-occupied France during the Second World War. Of contested legitimacy, it was finally headquartered in the town of Vichy in occupied France, but it initially took shape in Bordeaux under Marshal Philippe Pétain as the successor to the French Third Republic in June 1940. The government remained in Vichy for four years, but was escorted to Germany in September 1944 after the Allied invasion of France. It then operated as a government-in-exile until April 1945, when the Sigmaringen enclave was taken by so-called Free French forces. Pétain was permitted to travel back to France (through Switzerland), by then under control of the technically illegal Provisional French Republic, and subsequently put on trial for treason.

The zone libre (French pronunciation: [zon libʁ], free zone) was a partition of the French metropolitan territory during World War II, established at the Second Armistice at Compiègne on 22 June 1940. It lay to the south of the demarcation line and was administered by the French government of Philippe Pétain based in Vichy, in a relatively unrestricted fashion. To the north lay the zone occupée ("occupied zone"), in which the powers of Vichy France were severely limited.

In November 1942, the zone libre was invaded by the German and Italian armies in Case Anton, as a response to Operation Torch, the Allied landings in North Africa. Thenceforth, the zone libre and zone occupée were renamed the zone sud (southern zone) and zone nord (northern zone) respectively. From then on both were under German military administration.

The Dover Strait coastal guns were long-range coastal artillery batteries that were sited on both sides of the English Channel during the Second World War. The British built several gun positions along the coast of Kent, England while the Germans fortified the Pas-de-Calais in occupied France. The Strait of Dover was strategically important because it is the narrowest part of the English channel. Batteries on both sides attacked shipping as well as bombarding the coastal towns and military installations. The German fortifications would be incorporated into the Atlantic Wall which was built between 1942 and 1944.