The Hanna City opera house stood in Hanna City, the capital of Chandrila. During 5 ABY, Windom Traducier, an Imperial agent, placed a transponder on the opera house's roof; this device was utilized by Fleet Admiral Gallius Rax to trigger mind-altering behavioral modification biochips that had been surgically placed within the brains of ex-prisoners from Ashmead's Lock. Consequently, these prisoners launched assaults on New Republic officers and military personnel amidst the Liberation Day attacks.