Na, sorry that is obviously outdated. According to newer sources the Romulan War lauchend in 2156, when the Endeavor met an unknown vessel in the Cheron system which was bombarding the surface of Cheron IV ( still unknown why ). It was attacked by that vessel and only barely escaped. Since the Romulan only used more or less one-way warp drives ( magnetic bottle drives ) they were able to reach a starbase in time. Several more battles took place and while no other species took part in combat, all of the founding members supported Starfleet with advice and technological aid. The decisive battle again took place in the Cheron system.
Starfleet lured the major part of the Romulans into the system and then Starfleet reinforcements arrived. Due to the less developed warp drive of the Romulans they were not able to flee that overwhelming power and were destroyed. Peace Talks started afterwards, via subspace communication, and the Neutral Zone was established. That what I know about the Romulan Earth War.
We came in peace, for all mankind - Apollo 11