It's been a while since I've seen "Balance of Terror" so I don't know if this is answered in that episode, or in any other episode either. But I'd just like to know one thing: is it ever specified how long the war was? I know it ended up being established that the war ended in 2160 and the Federation was founded the next year, but did they ever indicate when it was supposed to start? Memory Alpha says the war was supposed to start in 2156, but was that ever established on screen? In other words, is it canon or fanon?
I'm asking because I've been pondering how Enterprise would've gone on if it hadn't been cancelled. If the Earth-Romulan War was supposed to start in 2156, that'd make it begin right around the end of season 5 / beginning of season 6. Which'd be awkward if they're aiming for seven seasons, as the show would end right in the middle of the war. There'd be no problem if there was no established duration of the war, though: they could start it right at the end of the series (in the finale, even) and segue directly into movies.
I'm asking because I've been pondering how Enterprise would've gone on if it hadn't been cancelled. If the Earth-Romulan War was supposed to start in 2156, that'd make it begin right around the end of season 5 / beginning of season 6. Which'd be awkward if they're aiming for seven seasons, as the show would end right in the middle of the war. There'd be no problem if there was no established duration of the war, though: they could start it right at the end of the series (in the finale, even) and segue directly into movies.