Dol Guldor Sauron's Mirkwood stronghold has it's own forces which focuses more on strength than the Mordor forces
Dol Guldor's Orcs are better trained capable of fighting in formation
Dol Guldor also employs the spiders of Mirkwood and their Queen
Trolls play a large part in Dol Guldor's armies being very well trained and varied in styles of combat
There are the Lesser Trolls,they are smaller then other breeds of Trolls but they are more intellegent and can even be trained to use siege weapons and Crossbows
then there is the Etten a large two headed Troll that defends it turf with aggression and the Forest Troll that can hide in the Trees until it attacks
and finally the Banner Troll a Strong troll that carries a banner on his back giving leadership to nearby units.