Halm was an arid desert world, famous for its extensive mines. These mines contained rare Adegan crystals, which were used in the construction of lightsabers.
In 17 BBY, the Galactic Empire attacked Halm during the Western Reaches Operation, a military campaign that sought to destroy any Separatist holdouts. Imperial Ace Shea Hublin's fought in this battle.
- "Imperial troops have raided a mining operation on Halm. Why do they bother, I wonder, mmmm?"
- ―Yoda, to Luke Skywalker
A Gran mining colony on Halm was raided by the Empire after the Battle of Hoth, but was rescued by Luke Skywalker.
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