Frodo's visions at Amon Hen

[Inziladun]

Originally Posted by Legate of Amon Lanc

It seems like the atmosphere of conflict being just about to begin has been present there for some time, and after the Fellowship comes, it just falls upon Lórien at last. It isn't certainly as big as the later assaults from Dol Guldur, which are part of Sauron's war and are comparable to the attacks on Minas Tirith or Dale; it's probably something more akin to "border skirmishes". Nonetheless, enough to generate the smoke we are looking for

Along those lines, the smoke could also have been the result of the Lórien Elves themselves burning the dead Orcs that had fallen when they penetrated the wood in pursuit of the Fellowship. I don't know what else they would have done with those bodies.