This is all getting
very complicated! I say, rather than doing two things one after another (attempted murder of Koran; confrontation with the Lorien/Mirkwood Elves) let's do them at the same time.
My suggestion:
1) baddy-army splits
immediately: Thrak and Herding decide to look for their chance to kill Koran in the imminent battle.
2) Lorien/Mirkwood Elves run into the special forces (with Thrak, Herding and Koran) at a northern ford -- yipes! fight fight fight
The genius
of this plan is that it lets us jump right into a single scene (Elves fighting baddies) in which everything gets sorted round: Herding and Koran settle matters in the chaos of battle, Elves and Orcs duke it out. This has the added advantage of perhaps allowing a certain female Elf to help out a certain Easterling Captain. . .
3) Just when things look hopeless, the Lorien army arrives, destroys the special forces, then heads down to take out the main baddy-army. How did Lorien know of the impending attacks. . .? Hmmm. . .scouting parties found Caranbaith's body and knew that something was amiss!
You may all applaud me now.