 In June 1945, Strang became political adviser to the Commander-in-Chief of British forces in Germany, Bernard Montgomery.Strang again returned to the Foreign Office in 1947 and served as Permanent Under-Secretary of State for the German section from 1947 to 1949 and as Permanent Under-Secretary of State for Foreign Affairs from 1949 to 1953.The six years Strang served as Permanent Under-Secretary of State saw the gradual recovery of Europe through the Marshall Plan, the establishment of the Western European Union and NATO and the breaking of the Berlin blockade.