Mission to Bastion

Early in the Clone Wars, the Jedi High Council sent a squad of Jedi led by Jedi Master Ki-Adi-Mundi on a mission to discover the Separatists' purpose for establishing a presence on the planet Bastion, which resulted in a victory for the Galactic Republic.

Prelude
Following the First Battle of Geonosis, the newly formed Confederacy of Independent Systems continued to grow and extended their reach into the Outer Rim Territories. The Separatist Alliance planned on establishing several footholds in order to move towards Coruscant, the capital of the Galactic Republic. They operated on the planet Bastion to mine for ore found in the planet's surface. The Republic and Jedi High Council learned about the Separatist's plans to use Bastion as one of their footholds, thus sending Jedi Master Ki-Adi-Mundi and a small unit to reconnoiter Bastion in order to ascertain the Separatists' purpose for the world.

In light of the assignment Mundi was given, he decided to form a squad of his fellow Jedi which included Jedi Master Saesee Tiin, Jedi Master Kit Fisto, Jedi Master Adi Gallia and Jedi Knight Yarv Lask. Mundi and the squad left Coruscant aboard a T-6 shuttle. Prior to the Jedi's arrival, the Separatists deployed a unit of battle droids under the command of the tactical droid TL-95 to defend their operation from Republic interference.

The mission
As soon as the squad arrived on Bastion, they were met by a group of battle droids patrolling the area. Mundi commanded the squad to split up and take out the droids on patrol. Mundi and Gallia took out the B1-series battle droids, as well as the ones piloting Single Trooper Aerial Platforms, while Lask, Tiin and Fisto took out the B2-series super battle droids and a Octuptarra tri-droid. Lask jumped on the droid walker and cut it in half before joining his companions to finish off the remaining droids. While the patrol was attacked, TL-95 was informed of the Jedi's arrival.

The squad continued exploring the planet and as they walked through the jungle, Lask pointed out large clouds of smoke above the trees and the others could hear loud noises. The smoke and noises led them towards the end of the jungle at an open field with a few ore crawlers that were stripping the planet's surface. The field was full of battle droids deployed to guard the ore crawlers, revealing to the Jedi their purpose for occupying Bastion. Mundi once again split up the squad to attack the unit of droids on guard. Mundi took Tiin and Fisto as they began the attack, while Lask and Gallia followed behind them. TL-95 ordered his forces to strike back and kill the Jedi. The squad managed to destroy several droids but still needed to complete the mission. Mundi, Tiin and Fisto began to hijack the ore crawlers while they were still active so they could destroy them. Lask and Gallia were ordered to continue destroying the remaining droids until they got to TL-95.

As the duo pushed through the remaining droids, TL-95 ordered his troops to retreat. Before he could retreat as well, Lask and Gallia caught up to the tactical droid and ordered him to surrender. TL-95 complied but informed the Jedi that he held captives on the ore crawlers that were being hijacked. Lask grew anxious because he knew the ore crawlers were going to be destroyed. He became hostile and demanded TL-95 explain about the prisoners. Gallia advised that Lask stay calm and trust in Mundi to make the right decision in the event of prisoners being involved. Lask rejected her wisdom and destroyed TL-95 while letting the remainder of the droid unit escape.

After the others successfully destroyed all of the ore crawlers in the open field, they reunited with Lask and Gallia. Still disturbed about TL-95's allegations, Lask confronted Mundi about captives on the crawlers they just destroyed. Mundi assured him that he didn't find any prisoners on the ore crawlers or else he would of saved them, to which Tiin and Fisto vouched. Lask accused them of lying due to his belief that the Clone Wars began to turn the Jedi away from their role as peacekeepers. Mundi refused to entertain his claims before Lask ignited his lightsaber and challenged Mundi to a duel. The others opposed both of their behavior and objected against their foolish fight, but Lask grew frustrated and continued to call out Mundi. Although he was against fighting his comrade, Mundi activated his lightsaber and fought Lask. Mundi was able to defeat Lask and disarm him from his lightsaber. He decided to bring Lask before the Jedi Council so that they could decide his fate. Lask was confined in the T-6 shuttle, while the rest of the squad went back to make sure that all the ore crawlers were destroyed on Bastion.

Aftermath
Once the squad returned to Coruscant, the Republic sent clone troopers to deal with the remaining droid forces. The squad also brought back some samples of ore to study it's properties. Upon their return to the Jedi Temple, Lask was brought before the Jedi High Council and was charged with insubordination and treason. Although the Council planned to give him the death penalty, Mundi convinced them to exile him from the Jedi Order so he could follow his own path.