J-1 semi-autonomous proton cannon

The J-1 semi-autonomous proton cannon was a long-range self-propelled artillery unit used by the Confederacy of Independent Systems during the Clone Wars.
==Description==
This heavy droid cannon could be operated by one B1-Series battle droid in a side-seat, or by pre-installed droid brain. It did not have an automatic reloading chamber, but instead was a single shot breach-loader. Shells had to be manually loaded by at least two battle droids into the breach before each shot. The shells used were powerful enough to breach the shields of an Acclamator-class assault ship or completely destroy a LAAT/i Gunship with a single hit.
The artillery piece, resembling a flak gun, was mounted on top of four legs, similar to that of Advanced dwarf spider droids, which allowed it to turn and re-position itself, however, its turning rate was quite slow, its legs being the only rotational device.
==History==
These units were used during the Battle of Ryloth in 22 BBY, where they fired upon the Republic invasion force. Three cannons managed to take down a ship within seconds.
Mace Windu ordered a retreat due to the damage the fleet was taking, as the cannon shells were able to penetrate the shields. During the liberation of the prisoners, Obi-Wan Kenobi took control of one of the cannons and destroyed all other cannons with help from Waxer and Boil before having to abandon the cannon due to incoming fire from an AAT.
The proton cannons would later be used by Geonosians during the Second Battle of Geonosis where they destroyed many Republic LAAT/i and LAAT/c gunships.
==Behind the scenes==
In LEGO Star Wars III: The Clone Wars, The J-1 is the cannon option when fighting on the CIS side in large battles, a counter to the Republic's AV-7.
LEGO Star Wars 7869: Battle for Geonosis was a LEGO set released in 2011, it featured a model of this cannon that could fire a missile, had movable legs, and adjustable elevation and depression. The set also came with a BARC Speeder, Captain Rex, Luminara Unduli, a super battle droid and two B1 battle droids.
==Appearances==
*The Clone Wars 7
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===Non-canon appearances===
*LEGO Star Wars III: The Clone Wars
*LEGO Star Wars: Microfighters video game
==Sources==
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*Star Wars: The Clone Wars Comic 6.5
*Star Wars: The Clone Wars: Incredible Vehicles 
==Notes and references==
Category:Droid models of the Confederacy of Independent Systems
Category:Droid vehicle models
Category:Mobile artillery types
Category:Techno Union products
Category:Vehicle classes of the Confederacy of Independent Systems