From Gineipaedia, the Legend of Galactic Heroes wiki
The 17th Compound was one of 216 structures built to house Imperial prisoners-of-war in the Econia Internment Camp on the planet Econia, in the former Free Planets Alliance. On 10. November 788 UC (479 IC / 3588 CE) Imperial prisoners rioted, takings several Alliance soldiers hostage in the compound, including commander Jennings, Yang Wen-li, and Fyodor Patrichev. The building was destroyed by mortar fire in an attack ordered by captain Barnaby Costea that same day.