The Battle of Rondac III was a battle during the Dominion War between the Cardassian Union and the Dominion. Rondac III was part of the Cardassian Rebellion, when Damar ordered an attack on the Dominion cloning facility.
Although Damar lost over half his attack force in the battle, they were successful in destroying the Cloning Facility. (DS9: "The Changing Face of Evil")