A confrontation at a southeast Petaluma home ended with the arrest of a Novato woman suspected of assault with a deadly weapon, false imprisonment and resisting arrest, Petaluma police said Monday.

Chatpet Dumrongkitkaset, 51, went to the Adobe Creek home of a former boyfriend where the confrontation occurred late Saturday morning, said Petaluma Lt. Tim Lyons.

Lyons said the woman repeatedly pounded on the front door, demanding entry.

When 70-year-old resident Charles A. Davis began to open the door the force of her pushing on it caught the man, who slipped on a rug and hit his head on a hardwood floor, said Lyons.

The suspect then chased the man's girlfriend. Wendy Weiner, 63, ran upstairs, locked herself in a bathroom and phoned police while the suspect stayed outside the door allegedly threatening her.

Dumrongkitkaset resisted arrest, Lyons said, and officers forced her to the ground and handcuffed her.

She was released from the Sonoma County Jail after posting bail, according to jail records.

Paramedics treated Davis for the head injury, Lyons said.