Feuds start because one party thinks they were attacked, insulted, or otherwise harmed by the other party. Intense feelings of resentment trigger the initial revenge, which causes the other party to feel the same way. The dispute is then fueled by a long-running cycle of retaliatory violence. This ongoing cycle of provocation and retaliation makes it very difficult to end the feud peacefully. Feuds frequently involve the original parties' family members and/or associates. They can last for generations.