More than 260 violent men from Hull have taken part in a year-long programme to stop them battering their partners.
The Strength To Change project, aimed at tackling domestic abuse in homes throughout Hull, has been credited with saving lives and preventing children from being taken into care.
Officials estimate the programme has saved £7m in police, prison and social services costs since it was launched three years ago.
Police say they receive about 70 per cent fewer calls relating to each man successfully completing the programme.
The men have admitted psychological, physical, financial and sexual abuse of their partners, ranging from name-calling and intimidation to choking, stabbing and even rape.
The men taking part in the Strength To Change programme must volunteer, showing a willingness to address their violence.
When men refer themselves to the programme, they are asked to complete an assessment form about their behaviour over the previous two years.
Each man will then have about 15 one-to-one sessions with trained staff before moving on to group work with other men on the course.
Humberside Police are currently running an operation to support victims of domestic violence during Christmas and the new year.
Operation Nightwing involves a dedicated team of detectives to specifically attend reports of domestic violence.
Men who are seen by police will be encouraged to go to Strength To Change.