When Sir Charles Rowan died , leaving Sir Richard Mayne as the surviving Commissioner , Captain William Hay was drafted in to jointly run the force with Mayne .
The first Commissioners to hold the post were Lieutenant - Colonel Sir Charles Rowan and Sir Richard Mayne .
When Lieutenant - Colonel Lieutenant - Colonel   died , leaving Sir Sir   as the surviving Commissioner , Captain William Hay was drafted in to jointly run the force with Sir .
The first Commissioners to hold the post were Lieutenant - Colonel Sir Charles Rowan and Sir Richard Mayne .