Daily Alta California, Volume 16, Number 5211, 9 June 1864
Miscellaneous.
Colonel Arguellet, who lately arrived in this city from Havana, was yesterday morning at an early hour arrested in his hotel, by two persons who represented themselves to be United States Deputy Marshals. No information was given the Colonel as to the cause of his arrest, and it was with great difficulty, and after persevering inquiries, that his friends ascertained that he had been lodged in jail. He was subsequently removed from there, and his present whereabouts are unknown to his friends. Further proceedings will be taken this morning to probe the mystery which surrounds the case. The Colonel is an officer of the Spanish army, and stood very high in the social circles of Cuba.