killing General Grievous.
"After the Republic received word that Grievous was hiding on Utapau, General Kenobi was sent to kill him. Still weak and injured from his encounter with Windu, he immediately revealed his four arms and attacked the Jedi. During the duel, Grievous's craven reflexes kicked in, and his inability to penetrate Kenobi's Form III defense made his offense grow sloppy. Kenobi took advantage of this and altered the angle of his parries to cut Grievous's wrists. Grievous lost two of his hands to Kenobi before Clone Marshal Commander Cody and the 212th Attack Battalion arrived, ambushing the droid army. Fighting broke out all over Pau City between droid and clone forces."
"Grievous, deprived of most of his arsenal, picked up a electrostaff and charged at Kenobi, raising the staff to finish him off. But before he could deliver the killing blow, Kenobi used the Force to summon Grievous's personal blaster to his outstretched hand. He fired five shots through the gap in Grievous' chest plate into the general's gut-sack. The oils preserving Grievous' organs burst into flames, incinerating his remaining biological components and killing the famed cyborg."
http://starwars.wikia.com/wiki/Grievous#DeathThe cyborg components of the General were left for looters in accordance with the Galactic Republic's tradition.