near the end of the war, palpatine told the young jedi anakin skywalker that he was a sith lord, someone who uses the dark side of the force. when anakin told the jedi council that palpatine was a sith, mace windu and three other jedi masters went to palpatine's office to arrest or kill him. they failed because sidious tricked anakin in helping kill mace windu. he used this attempt as an excuse to give order 66 to the clone army. this order was given to clone troopers to kill any jedi they see. sidious also ordered anakin, now darth vader, to bring clone troopers to destroy the jedi temple and kill all the jedi there, even the children. most jedi were killed only a short time after the order was given.