In February 1958, McCartney invited his friend George Harrison to watch the band. The fifteen-year-old auditioned for Lennon, impressing him with his playing, but Lennon initially thought Harrison was too young for the band. After a month of Harrison's persistence, during a second meeting (arranged by McCartney), he performed the lead guitar part of the instrumental song "Raunchy" on the upper deck of a Liverpool bus, and they enlisted him as their lead guitarist.
Guevara was instrumental in creating the clandestine radio station Radio Rebelde (Rebel Radio) in February 1958, which broadcast news to the Cuban people with statements by the 26th of July movement, and provided radiotelephone communication between the growing number of rebel columns across the island.
On 27 February 1958 Raúl was made comandante and assigned the mission to cross the old province of Oriente leading a column of guerrillas to open, to the northeast of that territory, the "Frank País Eastern Front". As a result of Raúl's "Eastern Front" operations, he was not involved in the pivotal Operation Verano (which came close to destroying the main body of fighters but ended up a spectacular victory for Fidel), but Raúl's forces remained active and grew over time.