Had Smaug Lived to See LOTR...

[Erendis]

Originally Posted by Pitchwife

If Sauron would have controlled Smaug somehow, I doubt he would have sent him for the Ring instead of the Nazgûl, knowing how possessive dragons tend to get about treasures. But he certainly could have used Smaug to attack his other enemies - Thranduil probably first, then Lórien, possibly Rivendell, maybe even Gondor and Rohan. Like Tolkien says in LotR Appendix A III (Gandalf speaking):

Especially to attack Rivendel,which was hard to reach,even for those knowing where the Valley was,by the paths and the Ford of Bruinen.By air however and with all these forests around...Total massacre.