The Fourth Order was a division of the Cardassian military.
When Gul Jasad from the Seventh Order requested reinforcements for a confrontation with Deep Space 9 in 2369, units of the Fourth Order were the closest ships, approximately one day away. (DS9: "Emissary")
In Grathon Tolar's forged holo-recording, the Fourth Order was assigned to protect the flank of the 23rd Jem'Hadar Division as it advanced through the Glintara sector, in the planned Dominion invasion of Romulan space. (DS9: "In the Pale Moonlight")
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