A sonar decoy is a device for decoying sonar. Nevertheless, the FXR countermeasure proved to be highly effective in decoying German acoustic torpedoes. The system is capable of detecting, confusing, diverting and decoying the incoming torpedoes. Information on these instances of decoying is hard to come by. A flare goes through three main stages&colon; ignition, deployment, and decoying.