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Originally posted by Phantom
It was mentioned that the Enterprise faced off against several "Warbirds" at the Battle of Nerendra, nothing more specific then that. I think they may have just used the term "Warbird" to differ from the BoP, which in TNG was pretty much a Klingon term. But, who knows.
The "Warbirds" that attacked the Klingon outpost at Narendra III were from the Romulan fleet, of the Klingon design (from way back when the Klingons sold ships to the Romulans... sort of came back to bite them in the ass, didn't it?) According to the Vulcan Heart book series, the D'deridex was in design phase at that point.