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"Our new proton cannon are in the optimum position to prevent that, sir."
TX-20 to Emir Wat Tambor[src]

J-1 proton cannons[2] were a form of droid artillery that fired proton bombs. They were used by the Confederacy of Independent Systems during the Clone Wars against the Galactic Republic. They were deployed by the Separatists on the planets Ryloth,[1] Geonosis,[3] and Anaxes.[4]


During the Confederacy of Independent Systems's occupation of Ryloth, the tactical droid, TX-20 and his battle droids set up a battery of five of these proton cannons in the city Nabat. When the Republic Grand Army attempted to land there, the cannons were able to destroy one of the three assault ships. The cannons were then destroyed when Jedi General Obi-Wan Kenobi commandeered one.[1]

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