 In 1935 he returned to Germany as a member of the International Force supervising the Saarland plebiscite . Afterwards , he joined the German Intelligence Section at the War Office . In 1937 he became Assistant Military attaché in Berlin to Noel Mason @-@ Macfarlane . As such , Strong got to know many senior German military officers personally , including Wilhelm Keitel . Like Mason @-@ Macfarlane , he became convinced that war with Germany was imminent and inevitable . 
