in two ways. First, he excels at sowing dissension among his enemies, in
which case they would fight each other instead of him. Secondly, he might
send Sauron in disguise to teach the armies how to improve their technology,
but meanwhile, Sauron would make a master device that would control all the
other technology, something small he could keep near him at all times, maybe a
ring . . .
.
“I dislike Allegory - the conscious and intentional allegory - yet any attempt to explain the purport of myth or fairytale must use allegorical language. (And, of course, the more 'life' a story has the more readily will it be susceptible of allegorical interpretations: while the better a deliberate allegory is made the more nearly will it be acceptable just as a story.)” (From Tolkien Letter # 131.)