Siege of Telmaros (20 BBY)

The Siege of Telmaros was the culmination of the Hunt for Major Blood, a chase that had followed a series of assassinations of politicians on Coruscant. Master Cato Gisera and Knight Maran Teesa tracked the assassin to Telmaros, the headquarters of the military profiteering group the Fist of Justice, headed by former Jedi Master Nioman Dakara. Determined to end this nuisance and the political threat posed by Dakara, Mace Windu led a considerable Republic force to take the planet.

What followed was a three month siege of the seemingly impenetrable Fist of Justice HQ, even after a fleet led by Plo Koon joined Gisera's ships to drive the Fist's fleet out of the system. After that, Gisera and Teesa went in pursuit of the Fist's remaining navy while Koon and his forces joined the fighting on the ground, alongside Windu and Masters Teuch Neuko, Kit Fisto, and Kyidyin Muchian. Despite an overwhelming numbers advantage, the Republic forces were unable to push past the heavy shield guarding the headquarters.

Three months in, simultaneous with a diversionary attack, padawans Cinigan Dakara, Azarp Bark, and Mihra Reyven infiltrated the base and knocked out the shield, though Dakara was captured in the process. Shortly after, the Republic forces succeeded in defeating the Fist of Justice garrison, though both Major Blood and Lord Nioman escaped.

Non-Canon
The following has been possibly, partially, or entirely retconned.

The Battle of Telmaros was the culmination of the Hunt for Major Blood, who had now fled there. The Fist of Justice headquarters was found out by Masters Mace Windu and Kit Fisto and reported to the Republic fleet under Adi Gallia and Plo Koon, which soon after invaded the planet.

What followed was a three month siege of the seemingly impenetrable Fist of Justice HQ, which held out against far superior Republic forces. Meanwhile, the two fleets engaged each other in the Battle of Riaan, which led to a Republic victory. Upon hearing that, Plo Koon and Mace Windu began a final assault on the headquarters, attacking from three sides and infiltrating the base itself. After heavy casualties, the Republic achieved victory but both Darth Nihalis and Major Blood escaped.

The battle was a complete defeat of the Fist of Justice and three of its six armies were almost completely decimated by the battle. Of all the major officers present, only Darth Nihalis and Major Blood are known to have survived.

Information
Date: 8.9.20 BBY-11.16.20 BBY

Location: Telmaros, Fist of Justice headquarters.

Leaders: Mace Windu, Plo Koon, Adi Gallia (Republic), Darth Nihalis, Major Blood (Fist of Justice).

Main Attack Force
Jedi Councilor Plo Koon

Jedi Master Cato Gisera

Jedi Knight Cinigan Dokoora

Jedi Knight Azarp Bark

104th Republic Legion

97th Republic Legion

88th Republic Legion

723rd Republic Legion

Members of the 554th Republic Legion

Flanking Squads
Jedi Councilor Adi Gallia

Jedi Councilor Teuch Neuko

Jedi Master Kyidyin Muchian

Jedi Master Sellon Tamor

215th Republic Legion

422nd Republic Legion

Members of the 127th Republic Legion

Other Combatants
Jedi Councilor Mace Windu

Jedi Councilor Kit Fisto

Jedi Master Siri Tachi

Jedi Knight Mihra Reyven

Fist of Justice
Darth Nihalis

Major Blood

Most of the Blood Corps Agents

FoJ First Army

FoJ Third Army

FoJ Fourth Army

Telmaros Garrison

FoJ Staff