The job of a film director is extremely challenging which requires the person to have knowledge of almost all the fields of film production. The success or failure of a film more or less depends on the capabilities of a film director.
On September 1, 1939, Hitler invaded Poland from the west; two days later, France and Britain declared war on Germany, beginning World War II. On September 17, Soviet troops invaded Poland from the east.
To the Americans, World War 2 started on December 7th, 1941, when Japan attacked Pearl Harbor. To Britain, France, Canada, Poland, World War 2 started on Sept. of 1939, when Nazi Germany attacked Poland.