 Complete the following phrase:  His coaching career began with the Bears in 1947, when he became an assistant coach to George Halas. After just two seasons with Chicago, Wilson left in 1949 for another assistant coaching position with the Detroit Lions, a division rival of the Bears. Prior to the 1957 season, he succeeded Buddy Parker as head coach. In his first year as head coach, Wilson guided Detroit to an 84 season and victory in the 