The security if the NSW colony was in the hands of the NSW Corps, not one of the British armys finest regiments. The officers were corrupt and after a sucession of weak governors had a stranglehold on trade in the colony. They would import spirits and use them as wages for the convicts and free settlers rather than paying in real money. The profits were enormous.
When Bligh arrived he determined to put a stop to this and he had the support of the majority of free settlers, however the NSW Corps, or Rum Corps as it was poplularly known, staged a coup and forced Bligh on a ship for England, thereafter running the colony as a military dictatorship until the arrival of Colonel Macquarie as governor. As he brought his own regiment of highlanders with him the NSW Corps quickly relinquished their rule and were disbanded soon after.