 Complete the following phrase:  Bony taught French as an Assistant Master at Eton College from 1937 to 1939. On the outbreak of the Second World War he returned to France and served in the French Army; he was captured, and spent from 1940 to 1943 in prisoner-of-war camps, where he continued his interest in medieval architecture, writing articles, compiling notes, making detailed drawings, and giving educational talks to his fellow-prisoners. He left the French Army as a first lieutet in 1944. Returning to the UK after the war, he taught briefly at Eton again 1945 to 1946, then became a Reader at the French Institute in London 1946-1961. In parallel with this he was a Visiting Lecturer 1948-1958 and external examiner 1950-1958 at the Courtauld Institute of Art, University of London. With George Zarnecki of the Courtauld he began a project in around 1960 to compile an exhaustive inventory of 