While traveling towards the end he came to Mexico in the summer of 1955. There, he met the exiled Castro brothers,
Raul and Fidel. With the two, he found common ground and beliefs. Che decided to join them in going to Cuba to take down Fulgencio Batista, dictator of Cuba. Che started off as a doctor for the army but started working more directly for the revolution.
They started their base in the mountains of Sierra Maestra, first attacking Moncada and attracting the attention of civilians all throughout the country with their revolts. The large focus for Guevara during the time was primarily land reform, which he succeeded in doing with the takeover of different areas of Cuba. Guevara said that taking over different areas in a revolution is a crucial step to completing the task, "the spearhead to the movement". Eventually Fidel Castro began to give Che more powers and then he put Che as the head of the socializing progress.
On News Years Day, after the battle in Las Villas, the Batista regime fell and Castro became the leader of Cuba.
After their takeover Ernesto Che Guevara visited the Soviet Union twice in order to have closer ties with the communist country and have more economic support.Che tried to convince Krushchev to sign a military treaty to transfer the missiles, but U.S.S.R.'s leader declined.