Police were called to reports of a violent disturbance in Keddington Road and Keddington Crescent, Louth, at about 8.45pm on Sunday.
It was initially reported that six men and eight women were involved.
A police dog was deployed and officers at the scene had to use Pava spray and Tasers to quell the violence and to protect others and themselves.
Five people were arrested in connection with the incident, three men aged 18, 27 and 26, a 26-year-old woman, all from Louth, and a 32-year-old Marshchapel man.
A number of others, believed to have been involved, are currently being sought.
A 17-year-old Louth woman was detained in Grimsby Hospital with injuries to her face.
A woman police officer was treated for a dog bite and discharged from hospital.
A number of other people were treated near to the scene by ambulance staff and either declined hospital treatment or did not require it.
Officers trying to piece together exactly what happened are appealing for witness to contact them.
Anyone with any information should contact Sergeant Lee Willoughby of Louth or Detective Sergeant Andy Harwood of Skegness via the non-emergency 101 telephone number.