MILWAUKEE -- A man wielding a samurai sword and seeking revenge on a former friend had the wrong apartment when he attacked a man and severed his finger Sunday morning, police said.

Officers said the 24-year-old assailant was so drunk on his way to the apartment that he hit several cars parked on a nearby street, WISN-TV in Milwaukee reported.

The man knocked on several wrong doors first, damaging one of them with the 20-inch samurai-like sword, police said.

The last door he came to was kicked and struck with the weapon, police said, and when someone opened the door, the man went after him with the sword, severing his pinky finger.

Officers said the victim wasn't the man's former friend.

Neighbors said it was terrifying to hear the banging and screaming and not know what was happening.

"Scared, we were all scared. Everybody in the building was scared. I thought, 'No way am I opening my door,' 'cause my kids said when that happens, don't," one neighbor said.

Police said the victim forced the man out of the building and an off-duty police officer who lives nearby heard the commotion, arrested the man and took him to jail.

The victim was taken to the hospital and released.