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no, according to the soft canon book "Earth Romulan war: Beneath the raptor's wings" the Tellarites and Andorians were also involved, fighting on the side of Earth, however Vulcan, who's government knew about their ties to the Romulans, refused to fight.

In terms of actual declare open warfare it would appear that this was the only one between Earth and Romulus. Now there was of course the drone ship crisis which occurred before this and the tension between the Federation and the Empire in later years, but both these events involved other worlds.

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