The signing of the armistice with France in the Compiègne Forest on 24 June 1940 greatly changed the conditions of the Economic War. Hitler assumed control over the whole of Western Europe and Scandinavia (except for Sweden and Switzerland) from the north tip of Norway high above the Arctic Circle to the Pyrenees on the border with Spain, and from the River Bug in Poland to the English Channel. Germany established new airfields and U-boat bases all the way down the West Norwegian and European coasts. On 30 June 1940 German occupation of the Channel Islands began. In early August Germans installed Dover Strait coastal guns.