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Battle Droids are fictional, robotic combat units used in the Star Wars Universe. Though developed earlier, battle droids served as frontline units in the Trade Federation Army and for the Confederacy of Independent Systems during the Clone Wars era. They were mass produced on Confederate planets such as Geonosis, and some units survived into the Galactic Civil War and Legacy era. Battle droids were originally made by Trade Federation Viceroy, Nute Gunray, to prevent pirate attacks. When he was contacted by Darth Sidious, he attacked the peaceful planet of Naboo. The droids easily overwhelmed Naboo's military and put the people in camps where many died.
The Battle droid's appearance is based on the skeleton of the Star Wars species Neimoidian to instil fear on their opponents. Battle droids are designed to win through overwhelming numbers, even though a small group of battle droids can be destroyed by a Jedi Knight, enough droids can take down many Jedi, as seen in the Star Wars Episode II: Attack of the Clones Geonosis arena battle.
Battle droids were originally portrayed as being controlled by a large central computer, usually located on a heavily defended starship. If the central computer is destroyed, all battle droids under its control would cease to function. This occurred during the Battle of Naboo in Star Wars Episode I: The Phantom Menace, when Anakin Skywalker destroyed the Droid Control Ship. The monumental defeat spurred interest in independent droids, and this technique was put into action following the defeat. To combat this, the Trade Federation programed a short list of commands for the droid to complete if their command system is destroyed.
Star Wars Episode II: Attack of the Clones revealed that there were battle droid factories on the planet Geonosis and other Outer Rim Planets. As depicted in Star Wars Episode III: Revenge of the Sith, there are similar factories on the planets Mustafar and Mygeeto.
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