Name: Techno Union J-1 semi-autonomous proton cannon
Type: Droid Artillery
Length: 6.46 meters
Skill: Ground Vehicles 4D, Vehicle Blasters 5D
Crew: Either 1 Battle Droid or Integrated droid brain + 2 Loaders
Cargo Capacity: 0kg
Cost: 14,000 (used)
Move: 3, 10 kmh
Body Strength: 3D
Fire Arc: Front
Rate of Fire: 1 shot every 2 rounds
Skill: Vehicle Blasters
Fire Control: 3D
Description: 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.
This heavy droid cannon could be operated by one B1 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 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.
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.
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Stats by FreddyB, Descriptive Text from WookieePedia
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