Still the love of freedom grew and waxed stronger in Cuba. In 1828, a secret society known as El Aguila Negra (The Black Eagle) was inaugurated in Colombia and Mexico, by those patriots who were escaping the vengeance of Spain by remaining in exile. This movement was splendidly organized. It had branches, not only in Colombia and Mexico, but also in the United States, where recruiting offices were openly established, and in Cuba where its operations were secret. But the organizers of The Black Eagle could not make a move which Spanish spies did not report to their master, the Captain-General of Cuba. Every plan was known to him as soon as it was formulated. He made no secret of his determination to deal summarily with those who were plotting against the power of Spain, but he waited in hope that he might be able to seize the real brains of the expedition. Besides this, the declaration of Bolivar for the freedom of the slaves as one of the principles for which he was fighting, and the fact that he was so closely connected with these revolutionary movements in Cuba, excited at this time the fears and animosity not only of the slave owners in the United States, but also of the most selfish, greedy and powerful of this class--particularly those of Spanish birth and sympathies--in Cuba. Before the expedition could be actually started, the leaders were apprehended and a farce of a trial followed. The Captain-General was beginning to fear the new spirit which was abroad in the land. Perhaps he had discovered that cruelty and fierce opposition only fanned the flame. At any rate he commuted the sentence of death, and imprisoned the conspirators. Since Mexico had conspired against the Spanish occupation of Cuba, General Vives retaliated by a military expedition against Mexico, in 1828. A force of three thousand and five hundred men was sent against Mexico--not a large army, but General Vives expected that large numbers of Mexicans would join his soldiers, once they set foot on Mexican soil. A landing was made at Tampico, in August, 1828. Instead of being received with acclamations by the people of Mexico, the movement met with the most strenuous opposition. The expedition was surrounded by the Mexican army, and its members were glad to surrender and to make terms with the Mexicans by which they were allowed to return to Havana. In March, 1829, the would-be conquerors of Mexico arrived in Havana with none of the honors with which it had been planned to crown the victors.