Though he was ambassador in London from 1898 to 1920, Cambon spoke not a word of English. During his meetings with Edward Grey (who spoke no French), he insisted that every utterance be translated into French, including easily recognised words such as ‘yes’. He firmly believed – like many members of the French elite – that French was the only language capable of articulating rational thought and he objected to the foundation of French schools in Britain on the eccentric grounds that French people raised in Britain tended to end up mentally retarded.
– Christopher Clark, The Sleepwalkers p193. While Sleepwalkers is clearly well-researched I am far from sure the research supports the conclusions i.e. that the First World War was all one big accident. I may blog more on this sometime but equally I may not.