Those are all the units there are, I'll add the categories as we agree on them so anybody wishing to participate can immediately catch up to where we are or discuss any of the chosen categories.
A
Ambassadors from the Ringlo Vale - Swordsmen
Angmar Tribute - Support
Archers from Morthond - Archer
Arkenguard - Swordsmen, Elite
Army of the Dead - Swordsmen
Arnor Archers - Archer
Arnor Knights - Cavalry
Axe Fighters from Lossarnach - Swordsmen
Axe Throwers - Archer
B
Battering Ram- Siege
Battlewagon - Single, Support
Beorning - Single
Black Knights - Heroic, Cavalry
Black Riders - Heroic, Cavalry, Swordsmen
Black Uruk Archers - Elite, Archer
Black Uruk-Hais - Elite, Swordsmen
Blade Masters of Rivendell - Elite, Swordsmen
Bone Crushers - Elite, Swordsmen
C
Caras Galadhon Guards - Heroic, Archer
Carn Dûm Bowmen - Elite, Archer
Carn Dûm Pikemen - Elite, Pikemen
Carn Dûm Swordsmen - Elite, Swordsmen
Castellans - Heroic, Swordsmen
Catapult - Siege
D
Dale Bowmen - Archer
Dale Spearmen - Pikemen
Dale Swordsmen - Swordsmen
Demolisher - Siege
Dire Wolves - Swordsmen
Dol Amroth Soldiers - Elite, Swordsmen
Dol Guldur Archers - Archer
Dol Guldur Orcs - Swordsmen
Dol Guldur Pikemen - Pikemen
Dragon Slayer - Elite, Single, (Swordsmen)
Druedain Archers - Archer
Drummer Troll - Elite, Single, (Support)
Dunedain Pikemen (Arnor) - Pikemen
Dunedain Rangers (Imladris) - Archer
Dunedain Soldiers (Arnor) - Swordsmen
Dunedain Spearmen (Imladris) - Pikemen
Dunedain Swordsmen (Imladris) - Swordsmen
Dunland Spearmen - Pikemen
Dwarven Archers - Archer
Dwarven Crossbowmen - Archer
E
Earth Shaker - Siege
Easterlings - Pikemen
Elfhelm - Elite, Swordsmen,Pikemen,Cavalry
Elkriders - Elite, Archer,Cavalry
Elven Minstrel - Single, Support
Ent - Elite, Single, Siege
Erebor Catapult - Siege
Ered Luin Catapult - Siege
Erkenbrand - Elite, Swordsmen,Pikemen,Cavalry
Exiles - Cavalry
Explosive Mine - Siege
F
Farmhands - Pikemen
G
Galadhrim - Elite, Swordsmen,Archer
Glorfindel's Wind Riders - Heroic, Cavalry
Gondor Archers - Archer
Gondor Knights - Elite, Cavalry
Gondor Pikemen - Pikemen
Gondor Soldiers - Swordsmen
Gorthaur's Werewolves - Elite, Single
Grimbold - Elite, Swordsmen,Pikemen,Cavalry
Grond - Moved to Hero Status
Guardians of Erebor - Swordsmen
Guardians of Ered Luin - Swordsmen
Guardians of the Citadel - Heroic, Swordsmen,Pikemen
Guardians of the Iron Hills - Swordsmen
Guardians of the White City - Heroic, Swordsmen
Gundabad Warriors - Swordsmen
H
Halberdiers of Cirith Ungol - Elite, Pikemen
Haradrim Lancers - Cavalry
Hill Troll - Elite, Single, Siege
Hobbit Bowmen - Archer
Hobbits - Swordsmen, Archer
Hunters - Elite, Archer
I
Imladris Catapult - Siege
Iron Hills Catapult - Siege
Ironbreakers - Elite, Swordsmen
Isengard Orcs - Swordsmen
Isengard Scouts - Swordsmen, Archer
Ithilien Rangers - Elite, Archer
K
Knights of Dol Amroth - Heroic, Cavalry
L
Lake-Town Bowmen - Archer
Lake-Town Spearmen - Pikemen
Lesser Wraith - Single, Support
Lindon Guardians - Heroic, Swordsmen,Archer
Loremaster - Single, Support
Lorien Archers - Archer
Lorien Pikemen - Pikemen
Lorien Warriors - Swordsmen
M
Mine Berserker - Single, Siege
Mirkwood Archers - Archer
Mirkwood Border Guards - Archer
Mirkwood Spiders - Cavalry
Mirkwood Swordsmen - Swordsmen
Monster Killers from Pelargir - Pikemen
Morgul Archers - Archer
Morgul Orc Warriors - Swordsmen
Morgul Pikemen - Pikemen
Morgul Riders - Heroic, Cavalry
Morgul Shadow - Single
Mountain Troll - Single, Siege
Mumak - Elite, Single, Cavalry
O
Onager - Siege
Orc Archers - Archer
Orc Laborer - Single, Support
Orc Overseer - Single, Support
Orc Pikemen - Pikemen
Orc Slayers - Elite, Swordsmen
Orc Warriors - Swordsmen
P
Palace Guards (Arnor) - Elite, Swordsmen
Palace Guards (Lothlorien) - Elite, Pikemen
Palantir Guards of Amon Sul - Heroic, Swordsmen,Pikemen
Peasants - Swordsmen
Phalanx of Erebor - Pikemen
Phalanx of Ered Luin - Pikemen
Phalanx of the Iron Hills - Pikemen
R
Rangers of the Grey Company - Archer
Rhudaur Spearmen - Pikemen
Rhun Halberdier Warriors - Elite, Swordsmen
Rivendell Archers - Elite, Archer
Rivendell Lancers - Elite, Cavalry
Rivendell Spearmen - Elite, Pikemen
Rivendell Swordsmen - Elite, Swordsmen
Rohan Captain - Elite, Swordsmen,Pikemen,Cavalry
Rohirrim - Cavalry
Rohirrim Archers - Elite, Archer/Cavalry
Rohirrim of the Eastfold - Cavalry
Royal Guards - Heroic, Cavalry
Royal Vanguards - Cavalry
S
Scout of the Iron Hills (Ram Riders) - Single, Support > Elite, Cavalry
Shadow Guards - Heroic, Swordsmen
Shield Uruks - Support, Elite
Siege Ballista - Siege
Siege Ladder - Siege
Siege Tower - Siege
Sorcerers - Support
Spear Throwers - Elite, Archer
T
The Unburnt - Elite, Swordsmen
Thrall Master - Single, Support
Tower Guards - Elite, Pikemen
Trebuchet - Siege
Troll Catapult - Siege
Troll Stone Thrower - Siege
U
Ugluk Scouts - Single
Uruk Berserker - Single
Uruk Crossbowmen - Archer
Uruk Pikemen - Pikemen
Uruk-Hai - Swordsmen
V
Veterans of Khazad Dum - Heroic, Swordsmen
Veterans of the Last Alliance - Heroic, Swordsmen
W
Warg Archers - (Elite) Archer/Cavalry
Warg Riders - Cavalry
Werewolf - Elite, Single
Wight - Single
Wildmen Axe Throwers - Archer
Wildmen of Dunland - Swordsmen
Wolf Riders - Cavalry
Y
Yeoman - Archer
Z
Zealots - Swordsmen