Okay. Five years after the battle of Endor, the New Republic is menaced by the remnants of the Imperial Navy, led by a Grand Admiral named Thrawn, who appears in my av. He's freaking brilliant, since he is a Grand Admiral, and not all of the Imps are overpromoted like RL's workforce. Anyway, he basically tries to steal Republic ships at the shipyards of Sluis Van and so opens a grand offensive that almost brings the Republic to its knees.
The GFFA is from the New Jedi Order series, about twenty-one years after Endor, where an extragalactic alien species called the Yuuzhan Vong come in, smash the New Republic, and then the remainder of the galaxy unite in the Galactic Federation of Free Alliances, and at the battles of Ebaq 9, Mon Calamari, Muscave, Coruscant, and Zonama Sekot, finally beat the invaders.