Well according to the ones who where there (or professor
Tolkien) the battle began with:
Elves,
Men and
Dwarves on one side and
Goblins and
Wargs on the other side. Counting five
armies. The author/characters in the book considered it a
battle of five armies. Maybe incorrectly, but they did.
See the quote given by Grond:
quote:
--------------------------------------------------------------------------------
from the chapter The Clouds Burst,
"So began a battle that none had expected; and it was called the Battle of Five Armies, and it was very terrible. Upon one side were the Goblins and the
wild Wolves, and upon the other were Elves and Men and Dwarves.
--------------------------------------------------------------------------------
The example from Dutch history was a mere example. A war not lasting eighty years for real, but nevertheless named that way afterwards: The Eighty Years War.
Now, if we think they shouldn't have called the Wargs an army, and the
eagles should have been called an amry, is off course free to discuss. But the event was named the
Battle of the Five Armies.