Total war: Third Age reinactments and matchmaking

At the moment we are setting up the Battle for Helms deep.
So far it will be 3v3 and I have 3 players TOTAL willing to reinact it.
Total factions
Team 1: 1 Orcs of the Misty Mountains 2 Isengards
Team 2: 1 Silvian Elves 2 Rohans
Factions possibly reserved. 1 rohan 1 silvian elves 1 isengard.