The incident happened at about 10:30 p.m. Saturday at the American Legion Hall at 3712 Second Avenue.
Lt. Cynthia Donahue and Lt. Tony Knox attempted to break up the fight between three men. A suspect knocked Donahue to the ground three times. Knox was also punched by a suspect in the head and face, the police report showed.
Donahue called for help and used pepper spray on the three men.
Jose Morales-Ramirez, 23, Jean Morales-Ramirez, 19, and Jose Morales, 42, were all taken into custody. They face a series of charges including assault on a peace officer.