Damar was a Cardassian government and military leader who served under Gul Dukat and succeeded him as the leader of the Cardassian Union, under the Dominion. Fed up with being the Dominion's puppet and sacrificing the lives of millions of Cardassians for their cause, Damar eventually rose up and led the Cardassian Liberation Front against the Dominion.
When he led the rebellion, he was joined by Kira Nerys, Odo, and Elim Garak. Despite his and many of his troops' misgivings about working with a former member of the Bajoran Resistance, Damar recognized the value of Kira's knowledge of organizing resistance cells and followed her advice the best he could.
In the last days of the war, Damar was killed while leading an assault on Dominion Headquarters. Damar's last orders were to keep fighting; he died a martyr for the cause of Cardassian liberation, and both Elim Garak and Kira Nerys honored his final order by storming the Dominion headquarters, killing Weyoun and apprehending the Female Changeling.