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Black Bolt also rejects the Superhuman Registration Act and refuses to become involved in the ensuing "Civil War." Courtesy of the hero Sentry, Black Bolt monitors the situation. In the limited series "Silent War", the US military attacks the Inhumans to prevent them from retrieving the crystals. Believing the stolen crystals should be returned to Attilan, Black Bolt issues a warning to the United States concerning further acts of aggression, and eventually launches an offensive against the nation. Gorgon and other Inhumans are captured during the attack, which prompts Black Bolt to personally head a team to rescue his subjects and retrieve the crystals. While the mission is successful, Maximus takes advantage of the situation and overthrows and temporarily incarcerates Black Bolt.