Icorath was a desolate planet that had a Sith temple on it. Once it was discovered by the Jedi, they sent a large force of their own and Republic soldiers. But the Sith had a jamming device, that disrupted the shields of the many Jedi Transports that left the open in order to fire from turrets and Sith fighters. They still managed to land on the small planet and drove the Sith off the world. Once the Jedi established a temple on the planet, it became a thriving world with many huge cities.