Whangarei's City Safe officers will receive more training after one trying to break up an argument was punched in the face.
A female City Safe officer moved to separate a drunk woman and her partner fighting on Cameron St Mall when the woman attacked her.
The officer was bruised following the October 15 incident, which happened just after midnight, and took one day off work to recover.
CCTV recorded the incident and the attacker was arrested.
However the safety track record of the City Safe project - a collaboration between local police, Whangarei District Council and Northland Chamber of Commerce - was good, with just one assault since patrols began in 2007.