Under Rickey 's orders , all Pirate players had to wear the helmets both at bat and in the field .
This was the mandate of general manager Branch Rickey , who also owned stock in the company producing the helmets .
Under general manager 's orders , all Pirate players had to wear the helmets both at bat and in the field .
This was the mandate of general manager Branch Rickey , who also owned stock in the company producing the helmets .