Third Battle of the Jedi Praxeum

In the aftermath of the Battle of Korriban, former Jedi Jaden Korr took control of the Cult of Ragnos and renamed it to the Dark Order of Korr, and grouped all of his forces over the barren planet of Thule for organisation.

Jaden realized that many Jedi would be sent out by Luke Skywalker to hunt him down and capture him. He then concluded that to prevent this, he would have to attack first and leave the Jedi to lick their wounds while he strengthened himself in the dark side of the force.

So Jaden assembled a ground assault force on his flagship, the Dark Hand, to attack the Jedi academy on Yavin IV.

The Battle
The Dark Hand arrived over the Yavin moon and launched its ground forces unchallenged, due to the absense of a defense fleet. Upon landing, the swamp and scout troopers attacked the academy and drew many of the Jedi out. As the Jedi charged, the Imperial troopers fell back and spread out to the draw the Jedi further away from their territory and into the jungle to isolate and then kill them.

However, this plan half-backfired, as when not close together in large groups stormtroopers are easily picked off by Jedi. Nevertheless, many Jedi were claimed by blaster fire from multiple sides as well as the Jaden Korr's lightsaber.

Among the defending Jedi was Jorus Kuun, who was captured by Jaden and brought back to the Imperial landing zone for transport back up to the Dark Hand above the planet. Eventually, both sides took heavy casualties, and retreated back to their respective territories.

Aftermath
Although the Imperials took heavy casualties, it was of little consequence since individual stormtroopers were not as important to war efforts as individual Jedi were. The attack seriously demoralized the Republic, and many Jedi were killed or wounded.

Additionally, Jedi student Jorus Kuun was captured by the Imperials, and was later turned to the Dark Side by Jaden Korr. After the fighting, the Dark Hand collected the ground forces and returned to Thule.