How many Academy Awards did Walter Brennan win before the year that he starred in The North Star?
The North Star (1943 film): The North Star (also known as Armored Attack in the US) is a 1943 war film produced by Samuel Goldwyn Productions and distributed by RKO Radio Pictures. Walter Brennan:  He won the Academy Award for Best Supporting Actor in 1936, 1938, and 1940, making him one of only three male actors to win three Academy Awards.
three