With Arsenal's regular centre forward Henry White out of form and no money available to buy a replacement, Arsenal manager Leslie Knighton switched Turnbull from defence to attack, and the gamble paid off; Turnbull scored 21 league goals that season, including two four-goal hauls against Bolton Wanderers and Blackpool. Turnbull's goals saved Arsenal from relegation and they eventually finished a comfortable 11th.
Arsenal's regular centre forward Henry White was not performing well, no funds were available to purchase a replacement striker, manager Leslie Knighton moved Turnbull from defense to attack, which resulted in Turnbull scoring 21 league goals that season, including two four-goal games against Bolton Wanderers and Blackpool.  Turnbull's goals saved Arsenal from relegation and they finished the season in 11th place.