How many in Battle of 5 Armies?

[The Sixth Wizard]

I will, however, say this: it's already been pointed out that the Wood-elves had the experience and equipment for fighting in the open, as they participated in the Last Alliance. I assume that they would be superior bowmen than the English peasants in all respects: more naturally talented, better trained, better equipped, etc.

The English used a close-knit formation, usually on the flanks and rear of their army. They were trained in formation-firing, and after years of such work they were able to fire over the heads of their own men and hit the enemy consistently, through the orders of a captain who directed them. The elves would not have been drilled like this for a major battle, and were not the mercenary fighters (i.e people who did it all their lives, not peasants) that the English companies were. The Last Alliance was nearly three thousand years before this battle and the significance of Mirkwood's contribution even then was of debatable nature.

However I take into account that they were immortal, so they would have had plenty of time to learn one sunny weekend...