Passage: The police acquired testimonies that Lord Arthur Somerset, an equerry to the Prince of Wales, was a patron. Both he and the brothel keeper, Charles Hammond, managed to flee abroad before a prosecution could be brought. The male prostitutes, who also worked as telegraph messenger boys for the Post Office, were given light sentences and no clients were prosecuted. After Henry James FitzRoy, Earl of Euston, was named in the press as a client, he successfully sued for libel.

Question: What did Henry James do successfully?
sued for libel