 Beginning in 1934, they were increasingly worried that Mosley's noted oratory skills would convince the public to provide financial support to the BUF, enabling it to challenge the political establishment.His agitation was officially tolerated until the events of the Battle of France in May 1940 made the government consider him too dangerous.Mosley, who at that time was focused on pleading for the British to accept Hitler's peace offer of March, was detained on 23 May 1940, less than a fortnight after Winston Churchill became Prime Minister.