Bishop was in turn deposed by a counter-coup in 1983 and replaced by a more radical government under Coard. In response, Scoon, acting through secret diplomatic channels, asked the United States and other Caribbean nations to intervene and depose the Coard government. He was well within his rights to do so, acting under the reserve powers vested in the Crown. After Coard was made aware of this, he placed Scoon under house arrest, but Coard himself was deposed by Austin on 19 October, after Bishop was killed trying to escape. On 25 October, the invasion of Grenada (codenamed Operation Urgent Fury) was launched by a joint U.S.-Caribbean force to depose Austin.