As we mentioned briefly earlier, things didn't exactly go smoothly during the filming of 'The Wizard of Oz'. You may have been getting that impression by now anyway. Victor Fleming is believed to have done the bulk of the work, and ultimately got the official credit for the job, but he was only one of four directors who worked on the film at some stage.
Richard Thorpe was the first to step up but had a number of issues with both the cast and the studio and was fired after only two weeks. George Cukor was the next man in the seat, but he was offered the chance to go and work on 'Gone with the Wind' and went to do that instead, presumably in a cooler studio with a less murderous costume department. King Vidor was the last man up, who finished and tidied up the job after Fleming had gone to replace Cukor on 'Gone with the Wind'!