The 1939–40 season was Bradman's most productive ever for SA: 1,448 runs at an average of 144.8. He made three double centuries, including 251 not out against NSW, the innings that he rated the best he ever played in the Sheffield Shield, as he tamed Bill O'Reilly at the height of his form. However, it was the end of an era. The outbreak of World War II led to the indefinite postponement of all cricket tours, and the suspension of the Sheffield Shield competition.