'Recent News and Rumors in the Realms', DM's Sourcebook of the Realms, Old Gray Box. Thats where you will find the most detailed accounting of the events in that timeline.
"I have never in my life learned anything from any man who agreed with me" --- Dudley Field Malone
Yes, FRC0 (circa 1356DR) basically sets the stage for Tilverton to be invaded by Zhents (it's a perfect staging point for a caravan route across the Anauroch, as if they need any reason to attack). FRA (which takes place immediately after the ToT, 1357DR) describes Tilverton as having been "liberated" (and now heavily garrisoned) by Azoun's Purple Meddlers.
Tilverton has also been subject to dragonrage several times. Destroyed by the Shadovar. Turned into a permanent Plagueland.