Miller and his partner, Kevin Tucker, were in their work truck when they came across the fight and jumped in to break it up.
"When he started putting his hands on her, my partner Kevin, he got out of the truck first. I was in the process of calling 911," Miller said.
Tucker said he couldn't stand to see a fight while everyone else stood around and did nothing.
"Putting your hands on a lady is just not the best thing to do, and that's what I was thinking. I can't let this man put his hands on this young lady," he said.
The two city workers got control of the situation and waited for police to arrive.
"Not a hero, not trying to be one. Just doing what my mom taught me to do," Tucker said.
The woman was arrested and charged with assault and battery, and the man was cited for disorderly conduct.