Battle of Korriban(Republic-Mandalorian Wars)

After taking control and basing the mandalorian rule in Onderon, he continued his invasion of the galaxy and decided to remove republic presence in all core sith territory, (primarily Korriban and Ziost). He took a mandalorian fleet, and occupied the former republic space station which orbited the world, Leaving no survivors. The Jedi who served aboard the space station fought ferociously against him and his armies, but failed in preventing them from conquering the planet. The space station remained intact. After securing both orbit and ground bases, he then discovered ruins of a sith academy on Korriban. After exploring it's inside he found a holocron which changed the face of the war.