I went back into Cuba in February 1961, two months before the Bay of Pigs invasion. I was only 20 years old, but I had trained with U.S. agents for more than a year in communications and intelligence. My cover was as a physics student, so I enrolled and took classes at the university in Santiago de Cuba. I didn't study much, though, because I was helping organize the urban underground and having daily communications with the CIA ... On April 17, 1961, I received a top-priority message that U.S. warplanes were bombarding the Cuban oilfields and that a large, well-armed force had landed in Las Villas. I remember it said: "Now is the time for all patriots to rise and fight." But I knew right then that everything was wrong, that we had been betrayed. Las Villas was a swamp with only one road out. And we were not prepared to fight the Cuban Army. The United States didn't provide air cover, and the invaders were left to their slaughter. Most of the underground in Santiago was rounded up, too. I sent a message back that said: "Impossible to rise. Most patriots in jail thanks to your damn invasion."