Howdy all!
Here's some starting points, as well as a possible direction in which we could go.
Background Info:
TA 3019, February - March
Lorien attacked three times from Dol Guldur
"...but besides the valour of the elven people of that land, the power that dwelt there was too great for any to overcome, unless Sauron had come there himself."
The borders undergo much, but the orcs are driven back. With destruction of Sauron, Celeborn leads forces over the Anduin and destroys Dol Guldur: Galadriel throws down its walls.
Mirkwood is invaded, in the end they overcome the orcs. On the day of the new year Celeborn and Thranduil meet in Mirkwood. Mirkwood is renamed Eryn Lasgalen, 'The Forest of Greenleaves'. Thranduial keeps northern Mirkwood. Celeborn takes southern Mirkwood and names it East Lorien.
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Fordim - You said that the armies did unite, though I cannot find that said anywhere. Where, from what did you learn this?
If we united the armies of Mirkwood and Lorien, it would open up many possibilities, and we could then have several ‘stories’ running at the same time. The story of Elves in Mirkwood and Lothlorien, male and female, warriors (from the inner border, the scout troop, an envoy to Thranduil, the united Elven army, etc.) and ‘counselors‘ (perhaps). With this wide range of perspectives you gain a much fuller effect, of not just the story, but the events of Middle-Earth around them.
What we would not receive from this is any true interaction between orcs an elves besides meeting them in battle, which would be something most interesting.
