A garrison was a military term for a collection of soldiers stationed at a specific location. During the Clone Wars, the Confederacy of Independent Systems invaded the planet Scipio with a full garrison of troops, which overwhelmed and massacred Clone Commander "Thorn" and his garrison who were part of the Coruscant Guard's Diplomatic service.
When Lando Calrissian protested over the conditions that Darth Vader was imposing upon him, Vader responded by threatening to leave a garrison at Cloud City. The Imperials did take over Cloud City and left a garrison behind.
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