After the initial invasion of Balmorra, the Empire found itself facing immense opposition. Many former members of Balmorra's army remained on the planet in the form of a loosely organized resistance force, taking advantage of their superior numbers and knowledge of the terrain to wage an ongoing guerrilla war. Resistance soon came in other forms, as well: rebellious citizens, treacherous factory foremen, saboteurs posing as allies and terrorist cells all tried to thwart the Empire's attempts to fully control the industrial world.
In response, the Empire has placed the territories it controls under strict lockdown, using a combination of propaganda and military policing to subjugate the unruly Balmorran population. Curfews are enforced and all citizens must apply for official IDs‒a process that tests their loyalty to the Empire‒or else be marked as resistance sympathizers and arrested. Punishments for attacks on Imperial infrastructure are regularly meted out against perpetrators' families, or even against the entire population; the lesson must be taught.
The Empire's long occupation of Balmorra has been marked by overt brutality against the citizenry and near-constant battles with resistance forces. Although the planet was conquered through ingenuity and highly original tactics, the subjugation of its people has followed standard Imperial doctrine: suspension of civil liberties, establishment of brutal prison camps and summary public executions of known rebels.
Where most worlds crumble into slave-like obedience after only a few months of such oppression, Balmorra's people refuse to surrender after years of suffering. The resistance has outlasted the predictions of both the Republic and Empire and survived multiple purges carried out by ambitious Moffs and sadistic Sith Lords. Indeed, the Empire's experience on Balmorra has forced it to re-evaluate its approach to conquest and dominance.