Cardassian High Command was the leadership body of the Cardassian Central Command. It was comprised of the commanders of the Cardassian Orders and other senior officers and military officials.
The High Command recalled the Sixth and Ninth Order from exploration duties to reinforce the Union during the Dominion War.
Following the loss of Terok Nor, Damar with High Command's authority assigned a idrig jagul to command the Cardassian space forces and a idrig arjagul to command the Cardassian ground forces.
At the end of the Dominion War the Jem'Hadar virtually killed every member of High Command. (The Dominion War Sourcebook: The Fires of Armageddon)