The Mandalore prison outpost was an Imperial jail situated on the world of Mandalore. Around 1 BBY, Alrich Wren, who was a Galactic Empire captive to guarantee his family's compliance, was transferred from Sundari to this location. The purpose of this transfer was to isolate him from any allies in the Mandalorian city. However, his stay was brief because he was soon put on a transport headed back to Sundari for a public execution. This execution was planned because Clan Wren was actively fighting Clan Saxon, who Emperor Palpatine had put in control of Mandalore. Shortly after Alrich's move, his daughter, Sabine, organized an attack on the jail. This attack was actually a distraction created by the Empire, designed to allow the vehicle group transporting Alrich to arrive at Sundari without incident.