The Eastern Midland Freedom Fighters are rebels that fight in the Eastern Midlands District. The Eastern Midlands is dictated by Governer James Fierce, he was with the homeland but betrayed them to serve Viceroy Vile.
Their leader is a woman who goes by the code name "Black Fox". Later on in the game you will get transmissions from her asking for help.
If you notice, after awhile, there will be smaller and smaller amounts of troops attacking you from the Eastern Midlands and more and more attacking from the Western Plains. This is expected to be the work of the rebels. One problem that the resistance has throughout the fighting is the enemy Rocket Batteries. The resistance doesn't have the force to take out the Rocket Batteries so you have to for them.