The Battle of Fondor took place in 40 ABY, as part of the Confederation-Galactic Alliance War. Fondor had earlier left the Galactic Alliance for the Confederation, and to shore up his prestige Chief of State Jacen Solo decided to retake the world. His co-Chief of State, Admiral Cha Niathal, saw this as her chance to overthrow Solo, and secretly began communications with Grand Master Luke Skywalker on the Alliance blockade of the world.
To assure his victory, Solo contacted the Imperial Remnant and offered them Bilbringi and Borleias if they would help him take Fondor. Grand Admiral Gilad Pellaeon and the Moff Council agreed, and sent their forces.
During the battle, Solo used the Force to ensure the Fondorians would lower their planetary shield. When they did so, he began bombarding the capital, Fondor City. Niathal offered the Fondorians a chance to surrender, which they took; not having been informed, Solo continued the attack. Niathal, using her position of Supreme Commander, relieved him of command for disobeying the laws of war, and ordered the Alliance fleet to disobey him. However, two-thirds of the fleet remained loyal to Solo. At the same time, Pellaeon refused to continue attacking the world that had surrendered. The Moffs aboard his flagship, Quille and Rosset, relieved him of command. He was then murdered by Jedi Knight Tahiri Veila, with the ship being boarded by Mandalorians and his body taken by Admiral Daala.
The remaining Alliance forces loyal to Solo were repelled from the system. Luke Skywalker negotiated with Niathal for her to use Fondor as her base of operations for her faction of the Galactic Alliance, forming a united front against Solo.