Easterlings are permanent reinforcements that come from the distant lands of Rhun to serve Mordor. They can be summoned on the edge of the map by unlocking and using the spellbook power "Reinforcements of Rhun" (3pp). They will then enter the map alongside Rhun Halberdier Warriors. They are the elite pikemen of Mordor, effective more through their numbers than their stats since Halberdiers of Cirith Ungol are statistically more powerful (but are capped to a maximum of 3 battalions). They are powerful enough to resist many units and can even withstand the fury of certain weaker Mass Slayer Heroes.
The Easterlings can be given the following upgrades:
The Easterlings are deadly pikemen and elite forces. This renders them particularly resistant to any troop and extremely effective against cavalry. In addition, unlike many other Mordor pikemen, the Easterlings can get into the Porcupine formation, which makes them immobile but incredibly deadly against cavalry. Overall Easterlings are elite troops that must be kept alive at all cost, and it is key to have them equipped with heavy armor as soon as possible since this will make them stronger. They can take on any basic infantry but will fail if they are at a disadvantage against elite infantry. They are free, strong, but limited by the timer. This timer can, however, be reduced if enough Tribute Camps are built. Like all other units they are affected by most leaderships and powers including Sauron's "Might of the Damned".